Answer:
First one is first option
Second one is the third option
Step-by-step explanation:
Option B

<em><u>Solution:</u></em>
Given that, we have to simplify the given expression
Given expression is:

We can simplify the expression by cancelling the common terms in numerator and denominator
Take the common terms out in given expression

Cancel the common terms in numerator and denominator

<em><u>Thus the simplified form of given expression:</u></em>

Thus option B is correct
Answer:
Step-by-step explanation:
a. 0.315 = 3.15 x 10^-1
b. 5,820,000,000 = 5.82 x 10^9
Answer:
Option D, 3 + 7x
Step-by-step explanation:
<u>Step 1: Combine Like Terms</u>
9x - 2x + 3
(9x - 2x) + 3
<em>7x + 3</em>
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Answer: Option D, 3 + 7x
A possible answer could be 9