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2 years ago

The sum of an unknown and eight is twenty. What is the unknown?

Mathematics

2 answers:

gregori [183]2 years ago

7 0

Answer:

Step-by-step explanation:

We can transform this into an equation in which the unknown will be represented by x. The word "sum" shows us that we are using addition, and we already know that we are adding 8 to the unknown (or x) and the answer to the equation is 20. Lets put this into a number equation now.

x+8=20

Now we just undo the equation. We have to subtract 8 from both sides.

x+8(-8)=20(-8)

x=12

The answer is 12. :) have a good day!

Zarrin [17]2 years ago

4 0

indicates subtraction

20 - 8 = 12

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A population has a standard deviation of 32. What is the standard error of the

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Answer: Population has a standard deviation of 32. What is the standard error f the sampling distribution if the sample size is 100?

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2 years ago

Justice hopes to build a fence around his garden he measures and determined that he needs 24 feet of fencing when he arrives at

Sunny_sXe [5.5K]

Answer:

It will cost $72 Justice to fence in his garden.

Step-by-step explanation:

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3 years ago

A line passes through (2,8) and (4,12) WHICH EQUATION BEST REPRESENTS THE LINE

Thepotemich [5.8K]

Well to find this answer, you would have to know the formula of a line, or also known as slope intercept form-- "y= mx+b"

1) Let's find the slope between the two points! (Use the y1-y2 over x1-x2 slope formula)

y1-y2
-------- = slope formula. Use the points 2,8 and 4,12
x1-x2

12-8 4 2
------ = ---- = ----- = our slope is 2!
4-2 2 1
^---- Here we simplify

2) Now we know our slope is 2! Substitute this into the y=mx+b formula

y=2x+b

3) Take one of the points we used for finding the slope and substitute it into our slope-intercept formula. That way we can solve for "b", our y-intercept.

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-4 -4 SUBTRACT (inverse operations)
----------
4=b SIMPLIFY (our final answer)

4) Now we know our y-intercept! Substitute it into the slope-intercept form to get our line.

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y=2x+4

5) Check your work by taking one of the points from above and substitute again!

y=2x+b
12= 2(4)+4
12= 8+4
12=12

Our equation works!

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3 years ago

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The sum of an unknown and eight is twenty. What is the unknown?​

The sum of an unknown and eight is twenty. What is the unknown?