SOMEONE PLEASE HELP ME

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.

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?

The number of fish in a lake can be modeled by the exponential regression equation y=14.08 x 2.08^x where x represents the year