f(b) = -1/6b + 8. Is the function rule if you want. further explanation just ask.
$19.04. If your mom gave you $14.28, and it only covered 3/4 of the cost, you have to first find 3/4 as a percentage, and then put it into a decimal. It would be 0.75. So then you have to divide 14.28÷0.75. It turns out to be $19.04.
The answer should be
780x + 1500y=31000
please correct me if i'm wrong