If a pound of cocoa cost $8, how many ounces can be bought for $2.25?

For the function, f(x) = -5x 2, find f(-4).

Which of the expressions (on the photo document i inserted) together represent all solutions to the following equation? 8cos(12x)+4=-4 *the answer should be in degrees.* > i would like for someone to explain the process to find the solutions for this.

Which of the following vectors are orthogonal to (2,1)? check all that apply