Find the slope of the secant line for f(x) = -x^2 + 20

Abcd is a parallelogram. the diagram is not drawn to scale. if m

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online

Icould really use some with this question.