Solve the following trig equation on the interval [0,2) 4cos^2x+3=4

Given the function f(x) = log base 4(x+8) , find the value of f^-1(2)

How many $20 bills do you need to have to make $280

Liz is shipping a package to her friend.the maximum weight of a medium flat-rate box is 20 pounds,including the box which weighs 6 ounces.write and solve an inequality to describe the possible weight ,w, of the contents that liz will ship to her friend if she must use a medium flat-rate box.