Answer:
Step-by-step explanation:

First you have to divide 45 by 16. that gives us 2.8125. then multiply 2.8125 by 80 to get 225.
c. (x + 5)(x - 7) use the FOIL method.
x² + 5x - 7x - 35
x² + (5x - 7x) - 35 collect like terms.
x² - 2x - 35
hope that helps, God bless!