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2 years ago

If the sum of a number and nine is doubled, the result is four less than the number. Find the number

Mathematics

1 answer:

Crazy boy [7]2 years ago

8 0

Answer:

- 22

Step-by-step explanation:

let the number be n then 2(n + 9) is the sum of the number and nine doubled, thus

2(n + 9) = n - 4 ← 4 less than the number

Distribute parenthesis

2n + 18 = n - 4 ( subtract n from both sides )

n + 18 = - 4 ( subtract 18 from both sides )

n = - 22

The number is - 22

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$\text{The scientific notation:}\\\\a\times10^n\\\\1\leq a$

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