You want to simplify or factor it?
Simplify:
7 * χ + 7 * -3 +5χ
=7χ + -21 +5χ
=(7χ+5χ)+-21
=12χ-21
Factor:7(x-3)+5x
12x-21
=3(4x-7)
The answer would be D, because you do 4200÷56=75 minutes. 75 minutes= 1 hour and 15 minutes
Essentially look at your formula sheets, Take notes on your assessment questions and you should be fine.
