Could you help me with these four Algebra problems?

Question

1. The sum of two numbers is x. If one of the numbers is 12, what is the other?

A)12 - x

B) x - 12

C) 12 + x

D) 12 x

2. The difference of x and a number is 6. What is the other number?

A) 6 - x

B) x - 6

C) 6 - (x - 6)

D) 6 + x

3. Twice a certain number is tripled. The resulting number is _____.

A) 2x + 3

B) 2x - 3

C) (2x)3

D) 1/3(2x)

4. After John worked at a job for 10 years, his salary doubled. If he started at $x, his salary after 10 years is _____.

A) $1/2x

B) $x + 2

C) $x - 2

D) $2x

Answer 1

1 b

2b

3d

4d