Question

If a = 9 and b = 4, what is the value of 2a – b?

A
10
B
B
14
25
D
72

Answer 1

Hey there!

2a-b

2(9)-4

18-4

14

Let me know if this helps :)

Answer 2

Answer: 14

Explanation: It’s a good idea to get into the habit of

using parentheses when substituting numbers in for variables.

Since a = 9 and b = 4, 2a - b is 2(9) - (4).

Now think about your order of operations.

Multiplication comes before subtraction so first multiply 2(9) to get 18.

So we have (18) - (4) which is 14.