Question

can someone please help me?

Answer 1

Answer:

The answer is 27

Step-by-step explanation:

The reason being, you can solve this 2 ways.

1) Combine like terms, 7a-4a = 3a.

Now just substitute (a=9) into 3a.

3 * (9) = 27.

2) Or just substitute a = 9 into the original expression.

7 * (9) - 4 * (9)

= 63 - 36 = 27

Answer 2

Hello!

Answer:

The correct answer is option four, 27.

Explanation:

We know that a = 9.

Because the a is right next to the 7 and the 4, this indicates that it is being multiplied.

7a - 4a

Substitute for the 'a'.

= 7(9) - 4(9)

= 63 - 36

= 27