Permutations and combinations! urgent!

if npr=6720 and ncr=56 what is r?
if npr=56 and ncr=6720 what is r?

For the equation below, x is the input and y is the output. y = -4x + 3 if the input is -8, then the output is

Okay so i didn't get this problem petro bought 8 tickets to a basketball game he paid a total of $200 write an equation to determine whether each ticket cost $26 or $28 so i didn't get this question so yeahyou have a good day.

The art class is planning to paint a mural on an outside wall. this figure is a scale drawing of the wall. width: 11 in length: 28 in unit rate: 1.5 ft per in. write the ratio of the area of the drawing to the area of the actual mural. write your answer as a unit rate. show that this unit rate is equal to the square of the unit rate 1.5 ft per in