Solve: y''+4y=xcosx using variation of parameters​

Solve the system of equations. y= 2x y= x^2 - 15

Which letters from the table represent like terms? a and b b and c a and d b and d

Sally deposited money into a savings account paying 4% simple interest per year. the first year, she earned $75 in interest. how much interest will she earn during the following year? show your work and explain your reasoning in the space provided below.