What is being done to the variable in the equation? a/-7 = 84?

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.

Two angles are complementary. the large angle is 36 more than the smaller angle. what is the measure of the large angle?

Which expression do you get when you eliminate the negative exponents of 4a^2 b^216a^-3 b