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shepuryov [24]
3 years ago
5

A number a decreased by 7 is 2.

Mathematics
2 answers:
umka21 [38]3 years ago
7 0

Answer:

9

Step-by-step explanation:

Let's first convert this to numbers. When a number is decreased by a certain amount, that is the same as saying that something is subtracted from it. Therefore:

a-7=2

Add 7 to both sides:

a-7+7=2+7

a=9

Hope this helps!

Minchanka [31]3 years ago
5 0

Answer:

9

Step-by-step explanation:

If a number (Let's call it x) has been subtracted by 7 (x - 7) then to find the previous number you just do the opposite. Let's call the end result y. 2 + 7 = x (Or y + 7 = x). <u>2 + 7 = 9.</u>

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3 years ago
Factor by grouping m(2a+b)-n(2a+b)+2n(2a+b)
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The factored expression of m(2a+b)-n(2a+b)+2n(2a+b) is (m + n)(2a + b)

<h3>How to factor the expression?</h3>

The expression is given as:

m(2a+b)-n(2a+b)+2n(2a+b)

Factor out 2a + b

m(2a+b)-n(2a+b)+2n(2a+b) = (m - n + 2n)(2a + b)

Evaluate the like terms

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Read more about factored expressions at:

brainly.com/question/723406

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