Sarah was paid $87 for 12 hours of babysitting and $65.25 for 9 hours. what is the constant of proportionality that describes this relationship ?

a (0.14
b (7.25
c (12.5
d (65

The variable z is directly proportional to x, and inversely proportional to y. when x is 4 and y is 13, z has the value 1.2307692307692. what is the value of z when x= 9, and y= 20

Simplify 4 square root of 2 end root plus 7 square root of 2 end root minus 3 square root of 2 . (1 point) 2 square root of 8 8 square root of 2 8 square root of 6 6 square root of 8

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4