The standard deviation of a sample was reported to be 4. The report indicated
that Σ ( x – average) ^2 = 544. What is the sample size?

Answer:8

Step-by-step explanation:

100*0.08

you would buy 8 cupcakes

The terms a0, a1, a2, and a3 of the sequence {an} in each case are as follows:

a. a0 = 0, a1 = 3, a2 = 6, a3 = 9

b. a0 = 0, a1 = 2, a2 = 12, a3 = 72

c. a0 = 0, a1 = 0.5, a2 = 1, a3 = 1.5

d. a0 = 0, a1 = 1, a2 = 2, a3 = 3

a. 2n + n

a0 = 2*0 + 0 = 0

a1 = 2*1 + 1 = 3

a2 = 2*2 + 2 = 6

a3 = 2*3 + 3 = 9.

b. n(n+1)!

a0 = 0(0+1)! = 0

a1 = 1(1+1)! = 2

a2 = 2*(2+1)! = 12

a3 = 3(3+1)! = 72

c. [n/2]

a0 = [0/2] = 0

a1 = [1/2] = 0.5

a2 = [2/2] = 1

a3 = [3/2] = 1.5

d. [n/2] + [n/2]

a0 = [0/2] + [0/2] = 0

a1 = [1/2] + [1/2] = 1

a2 = [2/2] + [2/2] = 2

a3 = [3/2] + [3/2] = 3

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D i.e. {C, T, U, -, *} is the minimal complete set of relational algebra operations.

What is relational algebra?

Relational Algebra is a query language that takes a Relation as input and returns another Relation as output. Relational algebra provides the theoretical basis for relational databases and SQL. The necessary column data for a relation is projected via projection.

Now,

As Five basic operations in relational algebra are : Selection, Projection, Cartesian product, Union, and Set Difference and all these are present in

{C, T, U, -, *}.

Hence,

            D i.e. {C, T, U, -, *} is the minimal complete set of relational algebra operations.

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The value of the side x is 6. Option D

It is important that we know the six different trigonometric identities in mathematics.

These identities are;

We have the sides are;

Hypotenuse side = x

Opposite side = y

Angle = 30

Adjacent side = 3

Then,

cos 60 = 3/x

Find the value

x = 6

Hence, the value is 6

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Using the box method, the expression is solved as: 4x³ + 8y² - 19y - 35 (see image below).

The box method, also known as the grid method or area model, is a visual technique for multiplying two expressions or expanding algebraic expressions. Here are the steps to expand an algebraic expression using the box method:

The box method shows how the expression has been expanded, thus, combining like terms, we have:

4x³ + 8y² - 19y - 35

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Answer:

C

Step-by-step explanation:

Supplementary angles are two angles that equal 180 degrees. An angle is 180 degrees when it's a straight line. As you see, the line with E, A, P, and B is a straight line, making A and B supplementary.

Answer: Supplementary angles because the 2 angles when they are joined they both add up to 180 degrees

Step-by-step explanation:

Answer:

PR = 288.75 feet

Step-by-step explanation:

There are two triangles that we need to consider:
ΔPRE and ΔPOC

These triangles are similar since
m∠PRE = m∠POC = 90°
∠PRE ≅ ∠POC

∠RPE ≅  ∠OPC (common angle)

AA Similarity theorem..
If two angles of one triangle are congruent to two angles of another triangle, then the triangles are similar.  

∴ ΔPRE ≅ ΔPOC

If two triangles are similar, the ratios of the corresponding sides must be equal

⇒ [tex]\dfrac{PO}{PR} = \dfrac{OC}{PE}\\\\[/tex]    (1)

PO = PR + RO
PR is the width of the river that is to be determined
Let PR = x

Then
PO = x + 165

OC = 330, RE = 210

[tex]\dfrac{PO}{PR} = \dfrac{OC}{PE}\\\\\Rightarrow \dfrac{x + 165}{165} = \dfrac{330}{210}\\\\[/tex]

Left side:
[tex]\dfrac{x+165}{x} = \dfrac{x}{x} + \dfrac{165}{x} = 1 + \dfrac{165}{x}[/tex]

Simplify  [tex]\dfrac{330}{210}[/tex]   by dividing both numerator and denominator by 30

=>
[tex]\dfrac{330}{210} = \dfrac{11}{7}\\\\[/tex]

Therefore
[tex]\dfrac{PO}{PR} = \dfrac{OC}{PE}\\\\\Rightarrow 1 + \dfrac{165}{x} = \dfrac{11}{7}\\[/tex]

Subtract 1 from both sides:
[tex]\dfrac{165}{x} = \dfrac{11}{7} - 1\\\\\dfrac{165}{x} = \dfrac{4}{7}\\\\[/tex]

Cross-multiply
[tex]165 \times 7 = 4x\\\\\Rightarrow 4x = 165 \times 7\\\\\Rightarrow x = \dfrac{165 \times 7 }{4} = 288.75\;feet[/tex]

Answer:

(a) 44%

(b) 32%

Step-by-step explanation:

(a) In order to find the percentage of students that prefer comedies, we can add up divide the sum of the total number of students who prefer comedies (Twice/month or less + Thrice/month or more) by the total number of students.  

Then, we can multiply this number by 100 to find the percentage:

[tex](\frac{45+21}{150})*100\\ (\frac{66}{150})*100\\ 44[/tex]

(b) To find the percentage of students who visit the movies three times a month or more, we can divide the sum of the total number of students who visit the movies three times a month or more by the total number of students.

Like before, we can multiply this number by 100 to find the percentage:

[tex](\frac{21+27}{150})*100 \\(\frac{48}{150})*100\\ 32[/tex]

The region for A' ∪ B ∩ C' is region III.

A Venn diagram is a visual representation that makes use of circles to highlight the connections between different objects or limited groups of objects. Circles that overlap share certain characteristics, whereas circles that do not overlap do not. Venn diagrams are useful for showing how two concepts are related and different visually.

Given:

So from the Venn diagram, the item represents the regions four, five, six and seven.

We have to find not A union B intersection not C.

A' is the complement of set A.

So, the region is for not A union B is represented by B.

and, then B ∩ C' gives the region B.

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In a case whereby It was recently estimated that domestic vehicles out number foreign vehicles by about seven to five. If there are 4152 vehicles in a county, the number of them that are domestic is 2422  domestic vehicles.

The concept that will be used here is simplification.

From the question, we were told that there are 7x domestic vehicles  as well as 5x foreign vehicle.

We can see that the x is the unknown number, which we need to find out,  

Then  we can make an equation as:

7x + 5x =  4152

12x= 4152

x=4152/12

=346

Hence we can say that there are  7*346 = 2422  domestic vehicles

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Answer:

Step-by-step explanation:

da fact that it sometimes get me wrong but it do works ngl

The page numbers of the book are 147 and 148.

Consecutive numbers are numbers that follow each other in order. They have a difference of 1 between every two numbers.

In a set of consecutive numbers,the mean and the median are Equal. If n is a number, then n, n+1, and n+2 would be consecutive numbers.

Given,

Left and right page numbers of a book are consecutive integers.

Sum of both integers = 295

Let x is left integer then right integer is x + 1

Equation becomes

x + x + 1 = 295

2x + 1 = 295

2x = 295 - 1

x = 294/2

x = 147

Left integer = 147,

Right integer = 147 + 1 = 148

Hence, 147 and 148 are the page numbers of the book.

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The size input which ABC's computer can execute in one minute for each algorithm for the following growth rates are given below:

For a growth rate of "n", it means the execution time increases linearly with the size of the input. In this case, XYZ's computer takes 1 minute to execute an input size of "n".

Company ABC claims that their computer is 100 times faster, so they can execute an input size of 100n in one minute.

For a growth rate of "2^n", it means the execution time increases exponentially with the size of the input.

In this case, if we double the input size, the execution time increases two times. So, if XYZ's computer takes 1 minute to execute an input size of "n", it would take 2 minutes to execute an input size of "2n".

Company ABC claims that their computer is 100 times faster, so to execute an input size of "2n" in 1 minute, the input size must be log2(100n).

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Answer:

aaaaaæaaaaaaaaaaaaaaaaaaaaaa

Answers in bold

[tex]\begin{array}{|c|c|} \cline{1-2}\text{Term} & \text{Coefficient}\\\cline{1-2}\text{x}^2 & \boldsymbol{1}\\\cline{1-2}\boldsymbol{-3\textbf{x}} & -3\\\cline{1-2}2 & \boldsymbol{2}\\\cline{1-2}\end{array}[/tex]

Explanation:

The given expression [tex]\text{x}^2-3\text{x}+2[/tex] is the same as [tex]\text{x}^2+(-3\text{x})+2[/tex]

This leads to the three terms as shown in the table above. Each term is separated by a plus sign.

The coefficient is the number to the left of the variable. Think of [tex]\text{x}^2[/tex] as [tex]1\text{x}^2[/tex] and think of [tex]2[/tex] as [tex]2\text{x}^0[/tex]

In other words, [tex]\text{x}^2-3\text{x}+2[/tex] is the same as [tex]1\text{x}^2+(-3\text{x})+2\text{x}^0[/tex]

The length of the third side could be 5.26 inches.

The Pythagoras theorem states that the square of the longest side must be equal to the sum of the square of the other two sides in a right-angle triangle.

[tex]|AC|^2 = |AB|^2 + |BC|^2[/tex]

There are 2 possible triangles that can arranged one being the 8 the longest side, and another one being the 5 and 8 the sides of the triangle

Given that triangle has two side lengths of 3.5 inches and 7.75 inches.

Using the pythagorean theorem to solve.

3.5² + 7.75² = x²

x² = 12.25 + 15.5

x² = 27.75

x = 5.26

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Answer:

1960g remaining

Step-by-step explanation:

2kg=total amount of tea

40g=amount of tea taken

Thus, covert 2kg to gram

2×1000=2000g

amount of tea remaining=total amount of tea –amount of tea taken

x=2000–40

x=1960g remaining

With a constant speed Robert took 20 minutes paddle.

The speed formula can be defined as the rate at which an object covers some distance. Speed can be measured as the distance travelled by a body in a given period of time. The SI unit of speed is m/s.

Given that, Robert paddled at a constant speed and travels 3/4 of a mile in 15 minutes.

We know that, Speed = Distance/Time

Speed = 3/4 ÷15/1

= 3/4 × 1/15

= 1/20 miles per minutes

Now, distance = 1 mile and speed =1/20 miles per minutes

1/20 = 1/Time

Time = 20 minutes

Therefore, with a constant speed Robert took 20 minutes paddle.

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The program for assigning variable and solving expression 2 * x * y - z is -

def func1(x, y, z):

  return 2*x*y - z

x= int(input("Enter x"))

y= int(input("Enter y"))

z= int(input("Enterz"))

solveEquation=func1(x, y, z)

print (solveEquation)

What is Expression in Code?

Expressions in computer science are written by developers, interpreted by computers, and 'evaluated.' The evaluation yields a result or return. Expressions in code include simple mathematical equations like 2 + 2. They are commonly referred to as arithmetic expressions.

The program for the condition given is -

def func1(x, y, z):

  return 2*x*y - z

x= int(input("Enter x"))

y= int(input("Enter y"))

z= int(input("Enterz"))

solveEquation=func1(x, y, z)

print (solveEquation)

Therefore, the coding has been done.

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The measures of the angles are:

n = q = j = 57°

m = l = p = k = 123°

Remember that vertical angles have the same measure, then:

n = 57°

And if the two horizontal lines are parallel, then the values in the correspondent quadrants are the same ones, then:

q = 57°

j = 57°

And adjacent angles add up to 180°, them:

57° + m = 180°

m = 180° - 57°

m = 123°

Then:

m = l = p = k = 123°

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Answer:

z=0.13 or z=-2/15

Step-by-step explanation:

First you must simply the fraction into a decimal, leaving us with 1.2 and 1.3. Then you subtract 1.3 from 1.2. Leaving us with z=0.13 or in fraction form,

z= -2/15

Answer:

see explanation

Step-by-step explanation:

(a)

let ∠ QRS = x then ∠ PQR = x and

∠ QPS = [tex]\frac{6}{7}[/tex] x and ∠ PSR = [tex]\frac{4}{7}[/tex] x

the sum of the 4 angles in a quadrilateral = 360°

sum the 4 angles and equate to 360

x + x + [tex]\frac{6}{7}[/tex] x + [tex]\frac{4}{7}[/tex] x = 360 ( multiply through by 7 to clear the fractions )

7x + 7x + 6x + 4x = 2520

24x = 2520 ( divide both sides by 24 )

x = 105

then

∠ QRS = 105° , so

∠ PSR = [tex]\frac{4}{7}[/tex] × 105° = 4 × 15° = 60°

(b)

∠ QPS = [tex]\frac{6}{7}[/tex] × 105° = 6 × 15° = 90° ← a right angle

Answer:

y = x + 1

Step-by-step explanation:

Since we have two points, we can find the equation of the line in slope-intercept form or y = mx + b, where m is the slope and b is the y-intercept.

We can find the slope using the slope formula, which is:

[tex]\frac{y_{2}-y_{1} }{x_{2}-x_{1} }[/tex], where y2 and x2 are one point on the line and y1 and x1 are the other point on the line:

Thus, we have:

[tex]m=\frac{7-26}{6-25}\\ m=\frac{-19}{-19}\\ m=1[/tex]

Now that we have the slope, we choose one of the points and plug in the slope to find the y-intercept:

[tex]26=1(25)+b\\26=25+b\\1=b[/tex]

On solving the provided question, we can say that the equations are 3x+4y=6 and 8x-4y=5 => x = 1 and y = 3/4

A mathematical equation is a formula that joins two statements and uses the equal symbol (=) to indicate equality. A mathematical statement that establishes the equality of two mathematical expressions is known as an equation in algebra. For instance, in the equation 3x + 5 = 14, the equal sign places the variables 3x + 5 and 14 apart. The relationship between the two sentences on either side of a letter is described by a mathematical formula. Often, there is only one variable, which also serves as the symbol. for instance, 2x – 4 = 2.

the equations are

3x+4y=6

8x-4y=5

adding both equation

11x = 11

x = 1

y = 3/4

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The solution is, Total estimated living expenses = $53,900.

In mathematics, multiplication is a method of finding the product of two or more numbers. It is one of the basic arithmetic operations, that we use in everyday life.

here, we have,

Estimated expenses for next 2 years:

Rent = 1100 * 12 * 2 = 26,400

Gym membership = 450 * 2 = 900

Gym monthly fee = 40 * 12 * 2 = 960

Renter's insurance = 60 * (12 * 2 / 6) = 240

Groceries = 300 * 12 * 2 = 7200

Eating out & entertainment = 175 * 52 * 2 = 18,200

Total estimated living expenses = $53,900

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Answer:

Step-by-step explanation:

To calculate the rate at which the water level drops, we need to find the volume of water being lost per second and convert that to a height change. The volume of water being lost is given as 0.05 liters per second. The volume of a cylinder with height h and radius r is given by the formula:

V = πr^2h

We can rearrange this formula to solve for h:

h = V / (πr^2)

Substituting the given values, we get:

h = 0.05 / (π * 20^2) = 0.05 / (π * 400) = 0.05 / 1257.0796

So the rate at which the water level is dropping is approximately 0.04 cm per second.

timer--;  //This statement uses the auto-decrement operator to decrease the value of the variable timer by 1.

The auto-decrement operator -- is used to decrease the value of a variable by 1. In this case, the variable is called timer. The statement which uses the auto-decrement operator is timer--;. This statement will take the current value of the timer variable and decrease it by 1. For example, if the current value of timer is 5, the statement timer--; will decrease the value to 4. This is a very useful and efficient way to decrease a variable's value by 1. It is also much shorter than having to write out a statement such as timer = timer - 1;. The auto-decrement operator can be used with other types of variables as well, such as strings or characters.

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Answer:

ok

Step-by-step explanation:

later