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3 years ago

I need help on 13-22 PLEASE

Mathematics

1 answer:

Katena32 [7]3 years ago

8 0

Answer:

-9

Step-by-step explanation:

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HELP ME PLEASEEEEEEEEEEEEEEEEEEEEEEEEEEE

ANTONII [103]

Multiply 400 times 0.70 and that’s how you get the % (in this case 280)

5 0

3 years ago

from the line y=2x-10 find the equation of the line that is perpendicular to this line and goes through the point (9,-5)

creativ13 [48]

2 is the slope so the slope perpendicular to that is -1/2 (negative reciprocal)
-5=-1/2(9) 9*-1/2=-4.5 and -4.5 - 0.5 = -5 so the equation for the line is y=-1/2x -0.5

5 0

3 years ago

Use systems of equations to solve the problem.

S_A_V [24]

X + y = 180
Y = wheat, x = oats
Y = x + 20. In the 1st equation, get y by itself getting y = 180 - x.
So 180 - x = x + 20. Subtract x on both sides to get 180 - 2x is 20. Subtract 180 to both sides is -2x = -160. Divide -2 to both sides is x = 80. So 80 + 20 is 100 wheat, and 80 oats of acres.

4 0

3 years ago

Read 2 more answers

How much change will you get back if you bought three 0.78 chocolate bars and paid with a $5 bill?

Hitman42 [59]

2 dollars and 66 cents

4 0

3 years ago

Read 2 more answers

In an effort to estimate the mean of amount spent per customer for dinner at a major Lawrence restaurant, data were collected fo

larisa86 [58]

Answer:

The 99% confidence interval for the population mean is 22.96 to 26.64

Step-by-step explanation:

Consider the provided information,

A sample of 49 customers. Assume a population standard deviation of $5. If the sample mean is $24.80,

The confidence interval if 99%.

Thus, 1-α=0.99

α=0.01

Now we need to determine $z_{\frac{\alpha}{2}}=z_{0.005}$

Now by using z score table we find that $z_{\frac{\alpha}{2}}=2.58$

The boundaries of the confidence interval are:

$\mu-z_{\frac{\alpha}{2}}\times \frac{\sigma}{\sqrt{n} }\\24.80-2.58\times \frac{5}{\sqrt{49}}=22.96\\\mu+z_{\frac{\alpha}{2}}\times \frac{\sigma}{\sqrt{n} }\\24.80+2.58\times \frac{5}{\sqrt{49}}=26.64$

Hence, the 99% confidence interval for the population mean is 22.96 to 26.64

3 0

3 years ago