Jack paid $120 to have his bus fixed at an auto-repair shop. The parts of the bus cost $72, and service was charged at $12
an hour. How many hours was the bus worked on?

If tana tanb=k, show that(1+k)cos(a+b)=(1-k)cos(a-b)

Erinn wrote the equation –5x + 4y = 32 to represent her hourly wage (y) and how this wage has changed during each year that she worked at a company (x). what is the rate of change in erinn's hourly wage per year?

Adeposit of 5500 at 6% for 3 years equals