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3 years ago

Which ordered pair is a solution of the equation? 7z -5 = 4y -6 Choose 1 answer:

Mathematics

1 answer:

ELEN [110]3 years ago

3 0

Step-by-step explanation:

7z-5=4y-6

-4y=-6-7z+5

-4y=-1-7z

y=1/4+7/4z

y=7/4z+1/4

7z=4y-6+5

7z=4y-1

z=4/7y-1/7

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A vender sold a combined total of 131 sodas and hot dogs. The number of hot dogs sold was 31 less than the number of sodas sold.

puteri [66]

Answer:

81 sodas and 50 hotdogs

Step-by-step explanation:

131 = x + x - 31

131 + 31 = x + x - 31 + 31

162 = x + x

x = 81

131 = 81 + (81 - 31)

131 = 81 sodas + 50 hot dogs

5 0

3 years ago

Boston can be very cold at -3 degrees Fahrenheit. If the temperature continues to drop at a constant rate for four days, what is

hoa [83]

Answer:

It depends what the constant rate it bt if it is -3 the it would be -3x4=12 and then -3-12=-15

Step-by-step explanation:

-15

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3 years ago

The Eagle Ridge Contractors Association claims the average price of a home in their subdivision is $125,150 with a standard devi

jonny [76]

Answer:

The test value is z = -1.31.

Step-by-step explanation:

The Eagle Ridge Contractors Association claims the average price of a home in their subdivision is $125,150.

This means that the null hypothesis is that the mean is this value, that is:

$H_0: \mu = 125150$

The Eagle Ridge Home Owners Association is interested in knowing if the costs of homes for sale in this subdivision are actually lower than claimed.

This means that at the alternate hypotehsis we test that the mean is lower than that value, that is:

$H_a: \mu < 125150$

The test statistic is:

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

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

125150 is tested at the null hypothesis:

This means that $\mu = 125150$

Standard deviation of $7,350.

This means that $\sigma = 7350$

A sample of 36 homes for sale in this subdivision had an average selling price of $123,550.

This means that $n = 36, X = 123550$

Compute the test value.

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

$z = \frac{123550 - 125150}{\frac{7350}{\sqrt{36}}}$

$z = -1.31$

The test value is z = -1.31.

5 0

3 years ago

How do you write 1.89 in words?

arlik [135]

One point eighty nine

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3 years ago

A person is walking 3 miles per hour. What is their rate in feet per second?

s344n2d4d5 [400]

The rate in feet per second is 4.4.

5 0

4 years ago