math help help pleasee

Answer:

x = -4, y = 7

Step-by-step explanation:

The two equations are:

5x + y = -13  ... (1)

-5x - 6y = -22 ...(2)

Isolate for x in (1)

5x + y = -13

5x = -13 -y

x = (-13-y)/5

Substitute this value of x into equation (1) -5x - 6y = -22

-5 · (-13-y)/5 -6y = -22

-1(-13-y) - 6y = -22

13 + y -6y = -22

y - 6y = -22 - 13

-5y = - 35

y = -35/-5 = 7

Substitute y = 7 in equation 1
5x + 7 = -13

5x = -13 - 7

5x = -20

x = 20/-5 = -4

Ans:

x = -4, y = 7

The percentage of her income is 17.9%

Percentage can be calculated by using the following rule:

Percentage = (fraction/total) x 100

Now, for this problem, the fraction of money used for expenses is 275$ while the total amount is 1536$

Substitute with these values in the above equation:

percentage = (275/1536) x 100 = 17.9%

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Correct question:

Juliet's budgets $275 each month for fixed expenses. What percent of her income is that amount if she nets $1536 each month?

The function f(x) is the sloping trail, it is the ratio of the change in the trail's height over the change in the trail's length.

It is the same as the rate of change of an evaluation of the trail, which is the derivative of a function that gives us the elevation. Thus, for a function F(x) that gives us the elevation, f(x)=F(x).

When we integrate a derivative, we can form a rate of change to total change. Thus integrating f(x) over an interval then the total change in elevation within that interval.

In this case, we will have to solve the integral:

[tex]\int\limits^9_7 {f(x)} \, dx[/tex]

The bounds of integration are 7 to 9, so this calculates the total change in elevation between 7 to 9, which is the total change in the elevation in the first seven miles of the trail.

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The graph of C against d for 0 ≤ d ≤ 7 is a straight line passing through (0, 50), (1, 70), ...

Linear equations are equation involving one or more expressions including variables and constants and the variables are having no exponents or the exponent of the variable is 1.

Linear equations may include one or more variables.

Given is an equation,

C = 20d + 50

We have to find the graph of the equation.

The points on the graph will be,

C(0) = 50

C(1) = 70

C(2) = 90

.........

The graph will be a straight line passing through (0, 50), (1, 70), (2, 90), ...

The graph is given below.

Hence the graph will be a straight line passing through (0, 50), (1, 70), ...

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Ethan deposited amount $144,000 over 31 years and made a total of $565,165.25 in interest.

Ethan's total deposit amount to his IRA was $144,000 ($400 per month for 31 years). The total amount he had in his IRA upon retirement was $709,165.25. This means that he made a total of $565,165.25 ($709,165.25 - $144,000) in interest over the length of the investment. This amount was likely made up of a combination of capital gains, dividends, and other investment returns. It is important to note that the interest rate can vary depending on the type of investments chosen, so this amount may be higher or lower depending on the types of investments made.

1. Calculate the total number of months Ethan invested for: 31 years x 12 months = 372 months

2. Calculate the total amount deposited: $400 per month x 372 months = $148,800

3. Calculate the total amount upon retirement: $709,165.25

4. Calculate the total interest made: $709,165.25 - $148,800 = $565,165.25

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The graph of dP/dt against P is a parabola, with the equation of the form [tex]y = ax^2 - bx[/tex] where a and b are positive parameters.

The graph has a vertex at [tex](b/2a, -b^2/4a)[/tex].

When P is less than b/2a, dP/dt will be positive, meaning the population is increasing. As P increases, dP/dt will reach a maximum at (b/2a, -b^2/4a) and then decrease, meaning the population is decreasing. When P is greater than [tex]b/2a, dP/dt[/tex] will be negative.

For example, if a = 4 and b = 1, the graph of dP/dt against P is [tex]y = 4x^2 - x[/tex], with the vertex at (0.5, -0.125). When P is less than 0.5, dP/dt will be positive, and when P is greater than 0.5, dP/dt will be negative.

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Answer:

(8x-7)<9

Use 1 to open the bracket

8x - 7 < 9

Add 7 to both sides

8x < 16

Divide both sides by 8

x < 2

Assuming that "in an easterly direction" means that the displacement from O to P is in the positive direction, the position of point P can be expressed as +50 km.

Positive numbers are typically expressed with no sign or with a plus sign (+) in front of them. For example, +5 or 7. Negative numbers are expressed with a minus sign (-) in front of them. For example, -3 or -10.

These expressions are used to differentiate between values that are greater than zero (positive) and those that are less than zero (negative).

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Answer:

960,000

Step-by-step explanation:

Every year, the number of blogs doubled.

The first year:60,000

The Second year: 120,000

The third year: 240,000

The fourth year: 480,000

The fifth year: 960,000

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Let pp be the number of players. We can write an equation to solve for the number of players.

1581.75 - 968.50 - (pp × 55.75) = 0

1581.75 - 968.50 - 55.75pp = 0

-55.75pp = -613.25

pp = 11

Therefore, the team can bring 11 players to the tournament. To find this, we subtracted the cost of the bus (968.50) and the cost of meals per player (55.75pp) from the total amount raised (1581.75).

We then divided both sides by -55.75 to solve for the number of players (pp) on the team.

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Answer:

14x + 36 = 15

Step-by-step explanation:

To remove the fractions, multiply the entire equation by the LCM of 9 and 6.

LCM of 9 and 6 = 18

Multiply the entire equation by 18,

    [tex]18*\dfrac{7}{9}x+*18*2=18*\dfrac{5}{6}[/tex]

           2*7x + 36 = 3 *5

              14x + 36 = 15

Let's consider what the question asks for:

--> equation without fractions:

To get rid of fractions, we must multiply a common multiple of 9 and 6 to get rid of the bottom denominator:

 --> common multiple of 9 and 6: 54

Let's multiple:

  [tex]\dfrac{7}{9}x+2=\dfrac{5}{6} \\\\54*(\dfrac{7}{9}x+2} )=54*\dfrac{5}{6} \\\\6*7x+108=9*5\\\\42x+108=45[/tex]

Answer: 42x + 108 = 45

The third side may be 6 or 9 metres long, or it may be between 9 and 15 miles long.

Depending on the lengths of the other two sides, the triangle's third side can have a variety of lengths. The third side's length could range from 9 to 15 metres if the first two sides are 6 and 9 miles, respectively. The reason for this is that the length of any two sides of a triangle must always be greater than the length of the third side; in this instance, the sum of the two sides is 15 metres, or 6 and 9 metres. As a result, the triangle's third side must be either less than or equal to 15 metres. A triangle can also have two equal sides, so the third side could also be equal to 6 or 9 metres. In conclusion, the third side of the triangle may be anywhere between 9 and 15 metres long, or it could be 6 or 9 metres long.

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The probability of a card being black given it is a queen is P(A|B) = P(A ∩ B) / P(B) = (4/52) / (4/52) = 1. This means that if you draw a queen from a standard deck of 52 cards, it will be black with a probability of 100%.

The probability of a card being black given it is a queen can be determined using the formula P(A|B) = P(A ∩ B) / P(B). Where P(A) is the probability of a card being black and P(B) is the probability of a card being a queen.

To calculate this, we first need to calculate the probability of a card being a queen, which is 4/52 (there are 4 queens in a standard deck of 52 cards). The probability of a card being black is 26/52 (there are 26 black cards in a standard deck of 52 cards).

Using the formula, the probability of a card being black given it is a queen is P(A|B) = P(A ∩ B) / P(B) = (4/52) / (4/52) = 1. This means that if you draw a queen from a standard deck of 52 cards, it will be black with a probability of 100%.

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There are 180 grams of cocoa in the resulting mixture.

When the 200 grams of dark chocolate and the 200 grams of milk chocolate are mixed together, the amount of cocoa in the mixture is found by adding the amount of cocoa in each type of chocolate.

First, the amount of cocoa in the dark chocolate is calculated by multiplying the total weight of the dark chocolate by its cocoa percentage:

200 grams(0.60) = 120 grams

Next, the amount of cocoa in the milk chocolate is calculated in the same manner:

200 grams(0.30) = 60 grams

Finally, the total amount of cocoa in the mixture is found by adding the amount of cocoa in each type of chocolate:

120 grams + 60 grams = 180 grams

Therefore, the total amount of cocoa in the resulting mixture is 180 grams.

The problem seems incomplete, it must have been...

"Luke melts 200 grams of dark chocolate that contains 60% cocoa and mixes it with 200 grams of milk chocolate that contains 30% cocoa. How many grams of cocoa are in the resulting mixture?"

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Answer: 7 √7

Step-by-step explanation: If you find the greatest common factor of 343, you get 49 and 7 and 49 breaks down to 7 and 7. you now have 3 7's. You now group two of those sevens and bring it out of the radical, leaving one 7 under the radical. This gives you 7 √7.

Check the picture below.

[tex]\sin(35^o )=\cfrac{\stackrel{opposite}{ST}}{\underset{hypotenuse}{34}}\implies 34\sin(35^o)=ST[/tex]

To calculate the probability of getting two bad pieces in a row, we multiply the probabilities of each individual bad piece that is 0.96 and 0.04

0.04 * 0.04 = 0.0016

So the chances of getting two bad pieces are 0.0016, or 0.16%. This means that out of 100 tries, you would expect to get two bad pieces in a row 0.16 times.

It's vital to remember that independent events, like obtaining two terrible pieces, have probabilities that are determined by multiplying the individual possibilities.

This is based on the idea of the multiplication rule of probability, which states that the likelihood of two unrelated events occurring simultaneously is the sum of the probabilities of each event occurring separately.

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Answer:

Step-by-step explanation:

This statement is incorrect. 12 is a product of 3 and 4, or 12 = 3 * 4.

Answer:

The result of 8 minus 3 is 5. Then, if you subtract u from 5, the result is 5 - u.

Answer: 5-u

Step-by-step explanation: Subtracting 3 from 8 is 5. Subtracting u from the result is 5-u.

A graph of the linear function with its points is shown in the image attached below.

In order to use the given linear function to complete the table, we would have to substitute each of the values of x (x-values) into the linear function and then evaluate as follows;

When the value of x = 0, the linear function is given by;

y - x = 4

y = x + 4

y = 0 + 4

y = 4

(x, y) = (0, 4).

When the value of x = 1, the linear function is given by;

y = x + 4

y = 1 + 4

y = 5

(x, y) = (1, 5).

When the value of x = 2, the linear function is given by;

y = x + 4

y = 2 + 4

y = 6

(x, y) = (2, 6).

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Answer:

Therefore, there is 8 children that is 9 years old and 6 children that is 11 years old.

Step-by-step explanation:

Let x be the no. of 9 years old and y be the no. of 11 years old.

x+y= 14 (1)

9x+11y= 138 (2)

From (1) :

x=-y+14 (3)

sub (3) into (2) :

9(-y+14)+11y= 138

-9y+126+11y=138

2y= 138-126

y= 6 (4)

sub (4) into (1) :

x+6= 14

x= 8

The selling price of each item when matched with the correct problem is :

Cost of CD : 14 . 50. Mark up : 30 % :

= 14. 50 x ( 1 + 30 % )

= $ 18. 85

Original price of a book : $ 18. 50, discount 45 %:

= 18. 50 x ( 1 - 45 % )

= $ 10. 18

Original price of shorts : $ 19. 99 , Tax 2%:

= 19. 99 x ( 1 + 2 %)

= $ 20. 39

Cost of MP3 Player : $ 129. 50. Mark up : 60 % :

= 129. 50 x ( 1 + 60 % )

= $207. 20

Original price of Concert tickets : $ 100. 00, discount 21 %:

= 100 x ( 1 - 21 % )

= $ 79

Original price of x - box game: $ 49. 95 , tax 3 %:

= 49. 95 x ( 1 + 3 % )

= $ 51. 45

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Answer: 3.65

Step-by-step explanation:

j=20

Substitute: 20-16.35

20.00-16.35=

3.65

Answer:

3.65

Step-by-step explanation:

Looking at the equation j - 16.35, if we substitute j for 20, the new equation will look like this:

Therefore, the value of the expression is 3.65 if we were to substitute j for 20.

The probability their sum is greater than their product is 11/36.

For at least a single two numbers is 1 when they are randomly selected from the range of 1, 2, 3, 4, 5, and 6.

Success is defined as a measure of probability when there is a number of potential outcomes.

For instance, there is the chance of tossing a coin & obtaining heads is 1 in 2, and there is only one way to acquire a head and there are a total of 2 possible outcomes head or tail.

Now we can indicate this with P(heads)

12 P(at least 1 one) = 1 - P. (no ones)

P(no ones)=(5/6)*(5/6)

25/36 P(at least 1 one)=(1 - 25/36).

P(sum higher than product)=P(at least 1 one) = 11/36

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Answer:

428km

Step-by-step explanation:

21 L=290km

1 L=290/21

31 L=290/21×31=428km (to 3 s.f.)

The difference between qualitative forecasting techniques and quantitative forecasting techniques is:

Quantitative projections frequently rely on historical information, like past sales and income numbers, production and financial reports, and website visitor statistics. You may use seasonal sales data, for instance, to estimate the production and labour requirements for the upcoming year based on the monthly or quarterly results from the previous year. Additionally, statistical modelling, trend analysis, or other information from authoritative sources like governmental organisations, professional groups, and academic institutions are used in quantitative forecasting.

Techniques for qualitative forecasting are derived from the knowledge and intuition of seasoned business professionals. These forecasting methods involve data interpretation together with the expert knowledge you've gained through years of work experience, so they go beyond simple guesswork. For instance, if you require qualitative data to predict sales for the year, you may calculate the influence of a new advertising campaign or promotion your business is preparing, consider the implications of emerging technology for customer behaviour, and consider current social fads and trends.

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The equation does not have solution is 13−4x+2=3x−7x+2

An equation is a statement that equals two algebraic expressions with 'equal to' symbol (=).

consider the given equations,

10−3x−1=7+3x+2, x=0 is the solution for this equation.

12−7x−10=x−8x+2, all real values makes this equation true, so the solution is (-∞,∞)

13−4x+2=3x−7x+2 has no solution.

15−2x−2=10x+3x+2 , has solution [tex]x=\frac{11}{15}[/tex].

Hence, equation with no solution is 13−4x+2=3x−7x+2.

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There are the four possible combinations of day and movie genre that Marty can choose from.

Marty has two options for the day of the week to go to the movie (Friday or Saturday) and two options for the movie genre (Comedy or Action).

Therefore, the list of all possible outcomes of one movie on one day is:

These are the four possible combinations of day and movie genre that Marty can choose from.

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3349/1260 is the amount, according to the provided document.

The outcome of an addition is a total. For instance, adding 1, 2, 3, and 4 results in the printed number 10. (1) Addends—also known as summands—are the integers that are being added together.

(a)

[tex]\begin{aligned}& \text { D) } \sum_{j=1}^7 \frac{2}{j+2} \\& j=1 ; \frac{2}{1+2}=\frac{2}{3} \\& j=2 ; \frac{2}{2+2}=\frac{2}{4}=\frac{1}{2} \\& j=3 ; \frac{2}{3+2}=\frac{2}{5} \\& j=4 ; \frac{2}{4+2}=\frac{2}{6}=\frac{1}{3} \\& j=5 ; \frac{2}{5+2}=\frac{2}{7} \\& j=6 ; \frac{2}{6+2}=\frac{2}{8}=\frac{1}{4} . \\& j=7 ; \frac{2}{7+2}=\frac{2}{9} \\& \sum_{j=1}^7 \frac{2}{j+2}=\frac{2}{3}+\frac{1}{2}+\frac{2}{5}+\frac{1}{3}+\frac{2}{7}+\frac{1}{4}+\frac{2}{9} \\& =\frac{3349}{1260}\end{aligned}[/tex]

(b)

[tex]\begin{aligned}\frac{7}{2} \frac{8+0}{2} & =\frac{840}{1}+\frac{840}{2}+\frac{840}{3}+\frac{840}{4}+\frac{840}{5}+\frac{840}{6}+\frac{840}{7} \\& =840+420+280+210+168+140+120\end{aligned}[/tex]

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