What is the common difference d of the sequence?

9, −8, −25, −42, −59,

d =

Tommy buys a sweater that is on sale for 40% off the original price. the expression p -0.4p can be used to find the sale price of the sweater, where p is the original price of the sweater. if the original price of the sweater is 50, what is the sale price?

If f(x) = 3x2 - 2x+4 and g(x) = 5x + 6x - 8, find (f-g)(x).

Need plz been trying to do it for a long time and still haven’t succeeded