What is the sign of the second term of the expansion of (x - y)^n for n = 3, 4, and 5? a. positive b. negative select the best answer from the choices provided a b

Dylan and dusty plan to take weekly surfing lessons together. if the 2-hour lessons are $20 per person and they plan to spend $100 each on new surfboards, what is the maximum number of lessons the two can take if the total amount spent for lessons and surfboards is at most $480?

The surface area of the triangular prism is .

Suppose y varies directly with x. write a direct variation equation that relates x and y. then find the value of y when x=12 y=7 when x=3