Investing $12,000 in a savings account at 2% annual interest compounded semiannually will result in approximately how much money after 5 years

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.

Use the method of cylindrical shells to find the volume v generated by rotating the region bounded by the curves about the given axis. y = 7ex, y = 7e^-x, x = 1; about the y-axis

Idon't get undoing if its pass adding and subtracting so can someone ? x-2 over 5 = 18