Please help me guys!!

Identify the parent function that can be used to graph the function f(x)= (1/4x)^3

If the wwight of a package is multiplied by 7/10 the result is 65.8 find the weight of the package

Clarence wants to buy a new car. he finds an ad for a car that costs 27,200 dollars. suppose his local sales tax is 7%. -how much would he have to pay? -what is the cost of the car including tax? -if clarence has 29,864 saved, can he pay cash to buy the car?