Answer:
B
Step-by-step explanation:
If you think about how it works when cups are stacked. you will begin with the height of the cup plus the height of the lip you would then add just the heigt of the lips until you get to the height needed. so your answer should be 19 cups
Answer:
0.25
Step-by-step explanation:
If we call the number "x" then:
x*25%=21
x*25/100=21
x=21*4
x=84
Using the quadratic formula works but if you know there are 2 answers (highest power of problem tells you how many solutions) then
10x^2 = 5x
So either x = 0, giving 0=0. Or divide by 5x
2x = 1
x = 0.5
