BananeroFresquero

What does it mean x2?

\(x^2\) or \(2*x\)

If x2 = \(x^2 \) 
x^2+20=84
x^2=64
x=sqrt(64)
x=8

If x2 = \(2*x\)

2x+20=84

2x=64

x=32

(8^2)^7=8^(2*7)=8^14=4398046511104

10+15+5=30 cups of lemonades

30*0.25= $7.5

Silas at first = S
S+6-20=S/(10/3)

S=20

Silas had 20 at first and he had 6 in the end.

(1/2.5h)x+(1/1.5h)x=1
x=0.9375

24/0.9375= 25.6

They will pass each other 25 times

Total: $62
20%=2/10

62/10*2= $12.4

The amount of the tip is $12.4

There are 9 possible numbers (1,2,3,4,5,6,7,8,9) that can be placed in 5 places.

N= 9^5 = 59049

1/59049 = 0.00169350878084%