Simplify and select the answer with the appropriate restrictions for the variable. will give brainliest answer.

[(x + 3) (x + 7)] / (3x + 21)

= [(x + 3) (x + 7)] / [3 (x + 7)]

= (x + 3) / 3

The denominator can't be equal to 0 therefore:

3 (x + 7) ≠ 0 ⇔ x + 7 ≠ 0 ⇔ x ≠ -7

whatever you can spend with $11.53 or under.

step-by-step explanation:

20 - 8.47 = 11.53. take away the money he used for lunch from the starting amount of 20.