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4 years ago

Can you help me solve 12 through 16 I don't get it

Mathematics

2 answers:

Alja [10]4 years ago

7 0

Can you take closer picture please:)

morpeh [17]4 years ago

3 0

All you have to do is divide
the fractions in the problems and get your answer for example number 15 4/5÷1/4
4×1=4
5×4=20 = 4/20 miles to go

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The perimeter of a rectangle is 50 cm and the length is 4 cm longer than the width. Write and solve the system of equations usin

k0ka [10]

P=2(l+w)
50=2(4+w)
50=8+2w
collect the like terms 50-8=2w
42=2w divide both sides by 2
w=21

6 0

4 years ago

You are trying to estimate the average amount a family spends on food during a year. In the past the standard deviation of the a

svetoff [14.1K]

Answer:

$n=(\frac{2.58(1000)}{50})^2 =2662.56 \approx 2663$

So the answer for this case would be n=2663 rounded up to the nearest integer

Step-by-step explanation:

We have the following info:

$ME = 50$ margin of error desired

$\sigma = 1000$ the standard deviation for this case

The margin of error is given by this formula:

$ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (a)

And on this case we have that ME =50 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

$n=(\frac{z_{\alpha/2} \sigma}{ME})^2$ (b)

The critical value for 99% of confidence interval now can be founded using the normal distribution. The significance is $\alpha=0.01$ . And for this case would be $z_{\alpha/2}=2.58$ , replacing into formula (b) we got:

$n=(\frac{2.58(1000)}{50})^2 =2662.56 \approx 2663$

So the answer for this case would be n=2663 rounded up to the nearest integer

5 0

3 years ago

What is the equation of a line parallel to the line y = 4x + 7 and passes through the point (3, 0)?

KATRIN_1 [288]

Two lines to be parallel their slopes have to be equal.

so m1 = m = 4

y = mx + b ( Slope intercept form)

y = 4x + b

(3,0) is on the line:

0 = 12 + b

b = -12

y = 4x - 12

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3 years ago

What is (6-2i)^2 in a+bi form?

Leya [2.2K]

32-24i . I hope this helps

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4 years ago

Does anyone know the answers to A, B, C, and D?

NeTakaya

It would be b because it the best choice

3 0

3 years ago