Can someone me with volume pyramids..

Find the value of the cosine for angle a

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12

You can ride your bike around your block 6 times and the whole neighborhood 5 times in 16 minutes. you can ride your bike around your block 3 times and the whole neighborhood 10 times in 23 minutes. how long does it take you to ride around the neighborhood?