Find y.

5x-3y=21

(Explanation would be helpful too.)

Answers

Answer 1

Answer: here is a possible answer:

x=9 (5x = 45)
y=8 (3y=24)

Subtract 24 from 45 and you get 21; this is how you check to make sure your answer is correct–by finding x

so, y = 24
I just used the guess and check strategy to get my answer

please mark as brainliest or give good rating if this helped you. I hope it did!

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The base of this solid figure has 4 equal sides and the faces are triangels

Answers

it is regular pyramid.

It's a pyramid of square base.

The McCalls insured their house for 90% of it's value. If the house is valued at $84,000, how much is it insured for?

Answers

84000 * 0.90 (equivalent to 90%) = $75600

The question is just asking for 90% of 84,000. To do this, you can change 90% into decimal by moving the decimal 2 place over which gives .90

After that, you multiply .90 by 84,000 which is $75,600

Another way to do this is to convert 90% to a fraction. To do that, you would put 90/100 which can simplify to 9/10. Then you would multiply that by 84,000. 1 of the 0's can cancel, so you are left with 9x8,400 which gives the same answer

A deli charges the same price, $4.60, for all of its different sandwiches. If a company ordered n sandwiches for a luncheon, which equation could be used to find the total price, P, that the deli charged for the sandwiches?

Answers

4.6 * n = p
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What is 0.07 in scientific notation?

Answers

To solve this we need to move the decimal to get greater then 1 and less then 10.
So to do this move the decimal over (the right)
Now we have 0.07 = 7x10^-2
We had to move the decimal 2 places over to get 7 and since we moved it to the right, its going to be a negative.
Your answer is
0.07 = 7x10^-2

What the the equation -984-n=-285 what does n equal

Answers

When you do this, you want to isolate one variable on one side of the equation. Add 984 to both sides, first. You get -n = 699.
You aren't done yet because the problem isn't complete until the variable is positive. To do that, multiply both sides by -1.
The answer is n = -699.
Hope that helped you!

-984-n=-285
+n
-984=-285+n
+285
-699=n

n is equal to -699

A nutrition label indicates that one serving of Apple crisp oatmeal has 2.5 grams of fat. How many grams of fat are there in 3.75 servings? Justify your answer