what is the answer for this math question -q/7>-1 im stuck on it

In given word problem Andre has more money than Elena after four weeks.

What is word problem?

A math word problem is a question that is written as one or more sentences and asks students to use their mathematical understanding to solve an issue from "real world." In order to understand the word problem, they must be familiar with the terminology that goes along with the mathematical symbols that they are used to.

Here,

Initial investment of Andre= $50

She add $5 per week for next 4 weeks , then

=> 4×5 = $20

Then total savings of Andre = $50+$20=$70.

Now Initial investment of Elena = $5

She adds $10 for each 4 weeks then

=> 10×4=$40.

Now total savings of Elena = $40+$5=$45.

Here $70>$45.

Hence after 4 weeks Andre has more money than Elena.

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The approximate angle between the base and a triangular face is; 79.43°

The dimensions of the pyramid are;

Side Length; a = 22 inches

Edge length; b = 61 inches

Using Pythagoras theorem:

h = height of pyramid

h = √(b² - 1/2a²)

h = √(61² - 22²/2)

h = √(3479)

h = 58.98

Slant height :

L = √(58.983² + 22²/4)

L =√(3479 + 121)

L = 60

Sinα = h/L

α = sin⁻¹(58.983/60)

α = 79.43°

That is the approximate angle found.

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The answer is 56 crickets.

The quantitative relation between two amounts shows the number of times one value contains or is contained within the other. for example-"the ratio of computers to students is now 2 to 1"

Given here: Greta has two pet lizards, Draco and Lizzy. For every 11 crickets Greta feeds Draco, she always feeds Lizzy 8 crickets. Thus the ratio is 11:8 Therefore if Draco got 77 crickets ten lizzy should get 8×7=56 crickets.

Hence, The answer is 56 crickets.

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The null hypothesis is H0: p = 403

The alternative hypothesis is given as: H1: p < 403

The null hypothesis is a statement that there is no significant difference or relationship between two groups or variables. It represents the status quo or the default assumption that there is no effect.

The alternative hypothesis is the statement that there is a significant difference or relationship between the groups or variables. It is the opposite of the null hypothesis and represents the research hypothesis or the claim that you are trying to test.

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Answer:  ∠M = 98°

Step-by-step explanation:

∠M = (3x-16)°

∠N = x°

∠O = (x+6)°

Sum of all angles in a triangle is 180°

Therefore, 180° = ∠M +∠N +∠O, substitute the given values

180° = (3x-16)° + x° + (x+6)° (add/combine like terms)

180° = (3x+x+x)° + (-16+6)°

180° = (5x)° + (-10°)

180° + 10° = (5x)° ( divide both sides by 5)

190°/5 = (5x)°/5

38° = x°

IF ∠M = (3x-16)°, substitute x°=38°,

Therefore, ∠M = 3(38)-16

                   ∠M = 114 - 16 = 98°

x<9

5(x+3)<60

x+3< 12

x<9

Which simply means x will always be less than 9 in this case.

These are the Simple inequation in one variable which can be simply solved by operating the same operations on both sides to get a simplified answer.

We follow the same algorithm even for equations where the left side and right sides are equal so we simply transfer the left digits to the right side simply by changing their operational signs like + will be -, * will be /.

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Answer:

[tex]\frac{12}{7}[/tex]

Step-by-step explanation:

[tex]3 /\frac{7}{4} = \frac{12}{7}[/tex]

Here is a trick to divide fractions
Take the 2nd fraction in this case [tex]\frac{7}{4}[/tex] and flip it [tex]\frac{4}{7}[/tex]
Change the division sign to a multiplication sign and multiply

[tex]\frac{3}{1} * \frac{4}{7} = \frac{12}{7}[/tex]

The 10 types of equation used in the mathematics are explained.

The definition of an equation in algebra is a mathematical statement proving the equality of two mathematical expressions.

Thus, the 10 types of equation are mentioned.

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The change of base property is a formula that makes it possible to express a logarithm in terms of logs expressed in a different base.

It is possible to express a logarithm in terms of logs stated in a different base using the change of base property formula. This is especially useful when evaluating a log to a base other than 10 or e using a calculator. X, a, and b are all taken to be positive. The base change property can be used to simplify equations with different bases for the logarithmic terms. All the logarithmic terms of an equation with logarithmic functions should have the same base in order to be solved.

Examples given below:

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a. Drive Co.'s revenue function R(X) = (-x^2/5)-247x.

b. The price per drive when revenue is maximized is $370.6.

c. The maximum profit made from the sale of these drives if Drive Co. incurs production costs of $179 per drive and has fixed costs of $250 is $6030.

What is a function?

The characteristic that every input is associated to exactly one output defines a function as a relationship between a set of inputs and a set of allowable outputs.

Drive Co. sells portable 905 hard drives when the price is $66/drive and can sell 800 hard drives when the price is $87/drive.

Let p be the price of hard drive and x be the number of hard drives.

When x = 905, then p = 66.

So, (x1,p1) = (905,66)

Similarly, when x = 800, then p = 87.

So, (x2,p2) = (800,87)

So, the equation of line between x and p is given as -

p-p1=[(p2-p1)/(x2-x1)}(x-x1)

Plugging in the values -

p-66=[(87-66)/(800-905)](x-905)

p-66=(21/-105)(x-905)

-105p+6930=21x-19005

-105p-21x=-19005-6930

-105p-21x=-25935

p=(-21x/105)-247

p=(-x/5)-247

So, the price function p(x) = (-x/5)-247.

Now, derive the revenue function -

Revenue = Number of drives × price per drive

Revenue = x · p(x)

Revenue = x · (-x/5)-247

Revenue = (-x^2/5)-247x

Therefore, the revenue function R(x) = (-x^2/5)-247x.

For maximum revenue -

dR/dx = R'(x) = 0 and R''(x)<0

dR/dx = -2x/5-247 = 0

-2x/5 = 247

x = -1235/2

x = -617.5

Therefore, the number of drives at maximum revenue is 618 drives.

The price per drive is -

p(618) = {-618/5}-247

p(618) = -370.6

Therefore, the price per drive is $370.6.

Now, the profit S(x) = Revenue R(x) - Total Cost C(x)

C(x) = fixed cost + variable cost

Variable cost = number of drives × price per drive

C(x) = 250 + 179x

Substituting the values -

S(x) = [(-x^2/5)-247x] - [250+179x]

S(x) = (-x^2/5)-68x-250

In order to get maximum profit differentiate the equation and equate it to 0.

dS/dx = 0

dS/dx = -2x/5-68 = 0

-2x/5 = 68

x = 340/-2

x = -170

d^2S/dx^2 = -2/5<0

So, maximum profit will be at x = 170.

S max = S(170) = [(170)^2 /5] - 68 (170) - 250

= 5780 - 11560 - 250

= -6030

Therefore, the maximum profit earned is $6030.

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The four ways to depict an inequality: solution graph, interval notation, set notation, and equation notation.

In mathematics, an inequality displays the connection between two values in an unbalanced algebraic statement. One of the two variables on the two sides of the inequality may be greater than, greater than or equal to, less than, or less than or equal to another value, according to inequality signals.

There are four ways to depict an inequality: solution graph, interval notation, set notation, and equation notation.

A comparison of any two values, known as an inequality, demonstrates whether one value is less than, larger than, or equal to the value on the opposite side of the equation. A relationship in a real-world scenario can be demonstrated by writing an inequality.

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Answer:

Step-by-step explanation:

To find the y-intercept on a graph, you must look at where the line intercepts through the y-axis.

For this problem it would be 16

Answer:

The Slope would be 3

The equation should be rearranged such that "y" is on the left and everything else is on the right.

Plot the "y=" line, using a solid line for y or y and a dashed line for y or y>. For "more than" or "less than" indications, shade above the line (y> or y), or below the line variable (y or y).

The symbols for less than and less than or equal to are "" and "," respectively. In contrast to less than or equal to, which requires that the variable or quantity be either equal to or less than the specified limit, less than means that the variable or quantity must have a value lower than the specified limit. There must be a difference between a and b's values.

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The complete question is " How do you graph the inequality y≥−5?"

No. of pages read on day of planning are represented by vertical intercept.

The difference between vertical intercept of original plan and line drawn by Lin is 10 unit.

The slope intercept form equation for a straight line with a slope, 'm', and 'c' as the y-intercept can be given as:

y = mx + c.

Given,

No. of pages Lin read on day of planning = 30

No. of pages she plans to read everyday = 40

If total pages are y for x days then,

y = 40x + 30

which is the original plan of Lin.

comparing it with slope-intercept form of line

y = mx + c

slope m = 40

vertical intercept of original plan c = 30 unit

slope m represents the no. of pages read everyday.

vertical intercept represents the no. of pages read on day of planning.

vertical intercept c' of line drawn by Lin = 40 unit

Comparing intercept of original plan to line drawn by Lin

= |c - c'|

= |30 - 40|

= 10 unit

Hence, the vertical intercept represents the no. of pages read on day of planning.

There is 10 unit difference between vertical intercept of original plan and line drawn by Lin.

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Therefore , as a result, the x, y, and z axes are the axis that the supplied coordinate plane problem is solved with.

The phrase "coordinate plane" describes a two-dimensional area made up of two rational numbers. It appears at the point where the X and Y axes connect, called the origin. A coordinate grid's numbers can be used to find points.

Here,

The x, y, and z axes of the Cartesian coordinate system,

which is used to represent three-dimensional space, are three axes that are mutually perpendicular to one another.

The origin is the location where the three axes converge.

Therefore , as a result, the x, y, and z axes are the axis that the supplied coordinate plane problem is solved with.

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Answer: C = P$3.89

Step-by-step explanation:

Option A will be the solution set of given linear inequalities.

What exactly are linear inequalities?

In mathematics, inequality denotes a mathematical expression in which neither side is equal. In Math, an inequality occurs when a connection produces a non-equal comparison between two expressions or two integers. The equal sign "=" in the phrase is substituted by any of the inequality symbols, such as greater than symbol (>), less than symbol (<), greater than or equal to symbol (≥), less than or equal to symbol (≤), or not equal to symbol ((≠). In mathematics, there are three types of inequalities: polynomial inequalities, rational inequalities, and absolute value inequalities.

Hence,

For given inequalities

y>4x+7

8x-2y>10

there will be no solution as the graph of these inequalities does not coincide anywhere.

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(-4,0) is the solution of the set to the system of inequalities

What is Inequality?

A  relationship between two expressions or values that are not equal to each other is called 'inequality.

The given two inequalities are

y<-3x-6 and 4x-2y<-8

Let us check for (-4, 0)

0<-3(-4)-6

0<6

4x-2y<-8

4(-4)-2(0)<-8

-16<-8

So (-4, 0) is the solution of the inequalities.

Now let us check for (0, 2)

replace y value as 2 and x as 0.

2<-3(0)-6

2<-6

Which is not true.

Hence, (-4,0) is the solution of the set to the system of inequalities.

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Answer:

a. 1500 = 1000 × 1.05^x

b. 1500 = 1000 × 1.05^x

Divide both sides by 1000

1500/1000 = 1.05^x

Take the natural log of both sides

ln(1500/1000) = ln(1.05^x)

ln(1.5) = x ln(1.05)

x = ln(1.5) / ln(1.05)

x = 5.12 years

64 marks must he score on her fourth exam to get exactly 80% in the course.

From the question, we are informed that Lisa is currently taking physics as one of her electives in school and that her grade at the end of the year is determined by the average of four exams, each worth 100 points.

First test = 84,

Second test = 92

Third test = 80

Forth test = y

And,

The fourth test is denoted by y.

Since we are told that she must get exactly 80% in the course and she took 4 exams, that means her total score will be: = 80 × 4 = 320

Therefore,

⇒ 84 + 92 + 80 + y = 320

⇒ 256 + y = 320

⇒ y = 320 - 256

⇒ y = 64

The fourth exam's score is 64.

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The correct options regarding given function  are (b), (c) and (f).

What is a function?

An association between each element of a non-empty set A and at least one element of a different non-empty set B is called a function.

The set of values that we are permitted to enter into our function is known as the domain of a function.

A function's range is the collection of values it gives as outputs.

The options given are:

a)The function f(x) = 9,000([tex]1.05^{x}[/tex]) represents the situation.

b)The function f(x) = 9,000([tex]0.95^{x}[/tex]) represents the situation.

c)After 2 years, the farmer can estimate that there will be about 8,120 bees remaining.

d)After 4 years, the farmer can estimate that there will be about 1,800 bees remaining.

e)The domain values, in the context of the situation, are limited to whole numbers.

f)The range values, in the context of the situation, are limited to whole numbers.

Now given,

Number of bees initially = 9000

Rate of decay = 5%

f(x) = Number of bee population after x years

So, f(x) = 9000([tex]0.95^{x}[/tex])

After 2 years, number of bees is

  f(2) = 9000(0.95²) = 8122.5 ≈ 8120

After 4 years, number of bees is

 f(4) = 9000(0.95⁴) = 7330.56≈7330

The domain of the function is number of years(x) which can be whole as well as decimal numbers.

The range of the function is number of bees after x years, which should be a positive integer number. So whole numbers are the domain.

Therefore the correct options regarding given function  are (b), (c) and (f).

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The 68-95-99.7 rule, also known as the empirical rule, is a shorthand for remembering the percentage of values in a normal distribution that lie within an interval estimate: 68%, 95%, and 99.7% of values lie within one, two, and three standard deviations of the mean, respectively.

The empirical rule, also known as the three-sigma rule or the 68-95-99.7 rule, is a statistical rule stating that for a normal distribution, nearly all observed data will fall within three standard deviations (denoted by σ) of the mean or average (denoted by µ).

The Empirical Rule states that 99.7% of data from a normal distribution is within 3 standard deviations of the mean.

68% of the data is within one standard deviation of the mean, 95% is within two standard deviations, and 99.7% is within three standard deviations, according to this rule.

Three-sigma limits that follow the empirical rule are used to define the upper and lower control limits in statistical quality control charts and risk analysis such as VaR.

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I decided to use Gallon Of Gas

The rate of change is 19.8 cents annually.

The average cost of a gallon of gas is $3.744 this year (2021).

Gas prices increased significantly in 2021, almost by $2 in some states, due to disease.

Gas prices forecast for the coming year!

Capital price at the average rate of change and economic fixtures: $4 per gallon (Real-Life Problems)

Detailed explanation:

Determine the average rate of change from 1960 to 2000 by computing the percentage change in the item's price for each decade.

A simple reveals the anticipated rise in petrol prices over the coming ten years.

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I made the decision to utilise a gallon of gas. The annual change is 19.8 cents. This year, a gallon of gasoline costs on average $3.744. (2021).

Disease caused a substantial rise in gas prices in 2021, almost by $2 in some places. Future gas prices, the average rate of change in capital prices, and economic indicators: At $4 per gallon (Real-Life Problems). By calculating the price change percentage for each decade, you can calculate the overall rate of change between 1960 and 2000.

A quick calculation shows how much gasoline prices are expected to climb over the next ten years. Subtract the original price from the new price to determine the percent change, then divide the result by the original price and multiply by 100. We must now calculate the percentage change when 25 is raised to 45. To determine the percentage change, we can easily use the formula.

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Answer: 25

Step-by-step explanation:

The sum of all exterior angles = 360

Using this, we can get the equation

2x+20+x+40+3x+6x=360

12x+60=360

12x=300

Simplify, and you get

x = 25

The solution of the given equation 3x² + 13x + 14 = 0 is given by :

option b . x = -2.

As given in the question,

Given equation is equal to :

3x² + 13x + 14 = 0

Solve the given equation by method of splitting middle term we get,

3x² + 13x + 14 = 0

⇒ 3x² + 6x + 7x + 14 = 0

⇒ 3x ( x + 2 ) + 7 ( x + 2 ) = 0

⇒ ( 3x + 7 ) ( x + 2 ) = 0

⇒ ( 3x + 7 ) = 0 or ( x + 2 ) = 0

⇒ x = -7/3 or x = -2

From the given options:

Option b . x = -2 is the solution of the equation 3x² + 13x + 14 = 0.

Therefore, the solution of the given equation 3x² + 13x + 14 = 0 is equal to : option b. x = -2.

The above question is incomplete, the complete question is:

Which of the following is one of the solution of equation 3x² + 13x + 14 = 0?

a. x = 2       b. x = -2         c. x = 3          d. x = -3

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The average rate of change for the quadratic function in the graph is 1

The proportion of change along the y-axis to change along the x-axis represents the average rate of change between the two points.

Since the graph of a quadratic function is curved and lacks a constant rate of change between any two distinct locations, it is referred to as the average rate of change rather than the slope.

The average rate of change between points (2, 0) and (3, 1) is

= (0 - 1) / (2 - 3)

=-1 / -1

= 1

The average rate of change within the interval 1 to 3 is 1

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Answer:

  4f-7

Step-by-step explanation:

You want the perimeter of a triangle whose side lengths are f, 2f, and f-7.

The perimeter is the sum of the side lengths:

  P = f +2f +(f -7)

  P = 4f -7

The perimeter of the triangle is 4f-7.

__

Additional comment

No such triangle can exist. The sum of the two shortest sides is f+(f-7) = 2f-7, which is not greater than the longest side, 2f. The triangle inequality is not satisfied.

The value of x is 27

From the information given, we have that the triangle is an isosceles triangle.

The properties of an isosceles triangle are;

We have that;

First side = x + 2

Second side = 2x - 25

Equate the two sides, we get;

x+ 2 = 2x - 25

collect like terms

x - 2x = - 25 - 2

subtract like terms

-x= -27

make 'x' the subject

x = 27

Hence, the value is 27

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It is not possible to construct a triangle whose sides are 8 cm 7 cm and 15 cm because the sum of two sides(8 cm and 7 cm) are equal to third side(15 cm).

In the given question, we have to check that it is possible to construct a triangle whose sides are 8 cm 7 cm and 15 cm.

The sum of the two sides must always be greater than the third side in order to determine whether or not the given sides may form a triangle.

To check this we firstly add the 8 and 7

8 + 7 = 15

15 = 15

Now we add 8 and 15

8 + 15 > 7

23 > 7

Now we add 7 and 15

7 + 15 > 8

22 > 8

It is not possible to construct a triangle whose sides are 8 cm 7 cm and 15 cm because the sum of two sides(8 cm and 7 cm) are equal to third side(15 cm).

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