Which of the following expressions simplifies to -abcd, where a, b, c and d are real numbers? A. (-a) • • -c) •d
B. (a) • b• (-c) • (-d)
C.
a o
(-b)
• (c) ed
o D. (-a) • (b) • (c) • (d)

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

Acompany produces packets of soap powder labeled “giant size 32 ounces.” the actual weight of soap powder in such a box has a normal distribution with a mean of 33 oz and a standard deviation of 0.7 oz. to avoid having dissatisfied customers, the company says a box of soap is considered underweight if it weighs less than 32 oz. to avoid losing money, it labels the top 5% (the heaviest 5%) overweight. how heavy does a box have to be for it to be labeled overweight?

Two cars which are 40 miles apart start moving simultaneously in the same direction with constant speeds. if the speed of the car which is behind is 56 mph and the speed of the other car is 48 mph, how many hours will it take for the car which is behind to catch up the car ahead of it?