6 Simplify the following. Leave your answers in index form, a) 4x4x3x5x3x4x5=
b) 2x3x2x3x5x5x5x5=
c) 32 x 5 x 5 x3 =
d) 52 x 53 x 32 X3 X5 32 X3x 11

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

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.

An initial investment of $100 is now valued at $150. the annual interest rate is 5%, compounded continuously. the equation 100e0.05t = 150 represents the situation, where t is the number of years the money has been invested. about how long has the money been invested? use your calculator and round to the nearest whole number. years