If y is 20% less than 90% of x and z is 25% more than 130% of y, then z is what percent of x?

This problem can be solved purely by analysis.

y is only 80% of 90% of x, therefore:

y = 0.80 * (0.90 * x)

y = 0.72 x                             ---> 1

z is 125% of 130% of y, therefore:

z = 1.25 * (1.30 * y)

z = 1.625 y                           ---> 2

Therefore combining 1 and 2:

z = 1.625 * (0.72 x)

z = 1.17 x

So z is 117% of x.

u what ?

step-by-step explanation:

-13

step-by-step explanation:

f(x)=2x-5 for f(-4)

f(-4)   means let x=-4

f(-4) = 2(-4) -5

f(-4) =-8-5

      = -13