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3 years ago

Two-thirds a number plus 4 is 7.

Mathematics

2 answers:

Scorpion4ik [409]3 years ago

8 0

The variable I am going to us is x.

2/3x+4=7

That will be your algebraic expression.

Rudiy273 years ago

4 0

2/3 x n + 4 = 7.

I believe it's this equation.

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Tcecarenko [31]

The answer would be d

3 0

3 years ago

What is the volume of the composite figure?

ehidna [41]

$\huge\boxed{\text{C.}\ 372\ \text{cubic inches}}$

We will find the volume of each rectangular prism separately.

<h3>Top Figure</h3>

$12*4*4$

$12*16$

$\boxed{192}$

<h3>Bottom Figure</h3>

$12*5*3$

$12*15$

$\boxed{180}$

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$\large\boxed{372\ \text{in}^{3}}$

7 0

3 years ago

A market research analyst claims that 32% of the people who visit the mall actually make a purchase. You think that less than 32

Rainbow [258]

Answer:

E. -1.48

Step-by-step explanation:

The test statistic is:

$t = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}$

In which X is the sample mean, $\mu$ is the expected value, $\sigma$ is the standard deviation and n is the size of the sample.

A market research analyst claims that 32% of the people who visit the mall actually make a purchase.

This means that:

$\mu = 0.32$

$\sigma = \sqrt{0.32*0.68} = 0.4665$

You stand by the exit door of the mall starting at noon and ask 82 people as they are leaving whether they bought anything. You find that only 20 people made a purchase.

This means that $n = 82, X = \frac{20}{82} = 0.2439$

The value of the test statistic is about:

$t = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}$

$t = \frac{0.2439 - 0.32}{\frac{0.4665}{\sqrt{82}}}$

$t = -1.48$

So the correct answer is given by option E.

3 0

3 years ago

An electrician charges $15 plus $11 per hour. Another electrician charges $10 plus $15 per hour. Which of the systems of equatio

olga2289 [7]

y=11x+15

y=15x+10

This is the system of equariob

7 0

3 years ago

The circumference of each of the smaller circles is 12 mm. Find the area of the shaded region.

podryga [215]

Answer:

11.45mm^2

Step-by-step explanation:

Given data

Circumference= 12mm

The expression for the circumference is

C= 2πr

12= 2*3.14*r

12= 6.28r

r= 12/6.28

r= 1.91mm

Hence the area of each small circle is

A= πr^2

A= 3.14*1.91^2

A= 3.14*3.6481

A=11.45mm^2

8 0

3 years ago