80% of x = 0.80x or 4x/5
Any fraction equivalent to 80/100 can be used to multiply x. You could also divide x by any equivalent to 5/4 or 1.25.
Answer:
40 books
Step-by-step explanation:
s = Stella's books
t = Tina's books
Given:
s = 5t
s - 16 = t + 16
Plug first equation into second:
5t - 16 = t + 16
4t = 32
t = 8 books
s = 5t = 40 books
((Check: 40 - 16 = 24 = 8 + 16 ✔ ))
Answer:
surface area is=2πr×r+πdh
Answer:
nothing, I just want free points!
thx