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3 years ago

If x = -5 and y = 2x^2, then y = ? *

Mathematics

1 answer:

Mrrafil [7]3 years ago

7 0

Answer:

x = -5

y = 2×^2

y = 2 x (-5 x -5)

= 2 x 25

y = 50

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Mr. Jackson filled up his 15-gallon gas tank for $37.50. What was the price 10

abruzzese [7]

Answer:

$Unit Price =\$2.5 \:per\: gallon$

Step-by-step explanation:

15 Gallon of Gas costs $37.50

To determine the Unit Price, we divide the Total Cost by the number of gallons of gas bought.

Unit Price

$=\dfrac{\$37.50}{15gallons}\\Unit Price =\$2.5 \:per\: gallon$

5 0

3 years ago

Read 2 more answers

The model represents an equation.

madreJ [45]

Answer:

9/5

Step-by-step explanation:

solve the original equation for x

-4× + 3 = 1x +(-6)

-1x

-5x + 3 = -6

-3

-5x = -9

/-5

x = 9/5

CHECK

-4(9/5) + 3 = 1(9/5) +(-6)

-21/5 = -21/5

8 0

3 years ago

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

Daniel picked out a book to give his dad for his birthday. Daniel only has 63cents from his piggy bank. His mom said she would p

Sauron [17]

Answer:

$13.44

Step-by-step explanation:

Daniel's money + Mom's money = $12.81 + $0.63

That is $13.44.

Hope that helps!

5 0

3 years ago

A blender costs $18 to make and sells for $21.60. find the markup rate.

RSB [31]

$21.60 - $18.00 = $3.60

$3.60 : $18.00 = 0.2

0.2 · 100% = 20%

5 0

3 years ago