Question

Again sorry to everybody but plesse help

Answer 1

No need to apologize, that's why we're here.

Rectangular prism, 25x10x8

The surface area is the sum of the area of all the surfaces.  We have 2 surfaces that are 25x10, two 25x8 and 2 10x8 so our total surface area is

2(25(10) + 25(8) + 10(8))=2(250+200+80)=2(530)=1060, choice B


Red marble, 15 out of 40, 15/40 = 3/8, choice B again


There's really not enough information to answer unless we assume the only ways Bart washes his car is the gas station or himself.  Assuming that, the probability he washes it himself is 1 minus the probability he washes at the gas station.

$p = 1 - \frac 1 4 = \frac 3 4 = 75 \%$, Choice D