Question

Angie adds 7 to the product of 8 and a number, and gets 39 as the result.

Which expression can be used to determine the value of the number?

A. 7 + 8 + n = 39
B. n + 7 × 8 = 39
C. 7 + 8n = 39
D. 7n + 8 = 39

Answer 1

The question is asking for a formula, so:
\[7 + 8x = 39\]
Can you solve from there?

Answer 2

The formula is :
8x + 7 = 39

Subtract 7 from both sides to isolate the 8x.
8x = 32

Divide both sides by 8.
x = 4

Hope this helps! :D