Find the equation of the line below

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.

What is the frequency of the sinusoidal graph?

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way