I NEED HELP PLEASE, THANKS!

Find the total area for the regular pyramid ( follow the answer set up in the picture)

Find the difference (8ab+a+2) - (3ab+6)

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