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3 years ago

-7y = -84 what does y equal

2 answers:

6 0

To "solve" equation with a single variable you perform whatever operations necessary to isolate the variable by itself on one side of the equal (or inequality) sign. Because it is an equality whatever operation you perform on one side you must also perform on the other side, otherwise you eliminate the equality of the expression or equation...

-7y=-84 divide both sides by -7

y=12

babunello [35]3 years ago

4 0

Okay, so first you need to divide both sides by -7!

That would leave you with y = 12 because:

-7y / -7y = y
-84 / -7 = 12

That equals

y = 12! Have a great day and I hope I helped!

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5m - 4n, when m=5 and n = 3.

tiny-mole [99]

Answer:

5m - 4n

5(5) - 4(3) ( As m= 5 and n= 3)

25 - 12

= 13

8 0

2 years ago

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grin007 [14]

I would say d that what i got.

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3 years ago

Students in a high school mathematics class decided that their term project would be a study of

weeeeeb [17]

The parameter of interest in this scenario is the proportion of all 1,000 students within the school who have "strict" parents or guardians.

<h3>How to calculate a test statistic?</h3>

In Mathematics, the test statistics of a given sample is calculated by using this formula:

$Z=\frac{x\;-\;u}{\frac{\sigma}{\sqrt{n} } }$

<u>Where:</u>

x is the sample mean.

u is the mean.

is the standard deviation.

n is the sample size.

In conclusion, a possible test statistic which can be used to estimate this parameter is the proportion of all students who have "strict" parents or guardians, based on the collected sample.

Read more on test statistic here: brainly.com/question/4621112

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8 0

2 years ago

At which root does the graph of f(x) = (x - 5)3(x + 2)2 touch the x-axis?<br> BB<br> -2<br> 2

Svetlanka [38]

Answer:

-2

Step-by-step explanation:

if x=- 2 then f(x)=(-2-5)3(-2+2)=0

so x=-2 is correct

3 0

3 years ago

An automotive manufacturer has developed a new type of tire that the research team believes to increase fuel efficiency. The man

Stolb23 [73]

Answer:

One tailed

To conclude if there is an increase in the mean gas mileage due to new type of tire.

Step-by-step explanation:

We are given the following in the question:

The manufacture wants to compare increase in the mean gas mileage.

Population mean = 32 miles per gallon

Thus, the manufacture could carry a hypothesis test to compare mean.

A one tailed test (z-test or t-test) based on the information can be used to compare the increase in mean.

Thus,

The automotive manufacturer should perform a one tailed hypothesis test to conclude if there is an increase in the mean gas mileage due to new type of tire.

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3 years ago