Raj is studying art at the local community college. He wants to take a stained glass art class that will count as 4 credits toward his degree. The college charges d dollars for each credit and a one-time fee of $150.00 for supplies. Raj determines that $540.60 will be the total cost of the class. Write an equation he can use to find d, the amount the college charges per credit.

How much does the college charge per credit?

"curse these trig-loving pirates! " devora mutters as she looks at the map. then, after thinking for a moment, she walks back to the entrance of the secret cave, measuring 48 meters along the way. after performing a calculation, devora walks back to the empty treasure, faces the entrance, and turns a certain number of degrees to her left before walking 89 meters to the treasure. supposing that the angle at the cave entrance is acute and that devora's calculations were correct, how many degrees did she turn?