Write an equivalent expression for 1/y^-1/4 using positive exponents

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

Atruck can be rented from company a $50 a day plus $0.60 per mile. company b charges $20 a day plus $0.80 per mile to rent the same truck. find the number of miles in a day at which the rental costs for company a and company b are the same

Identify the parent function that can be used to graph the function f(x)=3(x-9)2