Select the correct answer.
Which statement is true about this equation?
y = 2^x + 4

What should be done to solve the equation? x+14=21 add 14 to both sides of the equation. subtract 14 from the left side of the equation. add 14 to the left side and subtract 14 from the right side of the equation. subtract 14 from both sides of the equation.

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Collin did the work to see if 10 is a solution to the equation r/4=2.4