Ireally really need with this question! ! brainliest and 30pts

The axis of symmetry for the graph of the function f(x)=1/4^2+bx +10 is x=6. what is the value of b?

Translate the word phrase into a math expression. 15 fewer than the product of 4 and a number. (pls immediately)

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.