Help fast pls Determine the unit rate for each size. Then order the sizes from least to greatest unit rates.

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

Iwill give brainliest. suppose tommy walks from his home at (0, 0) to the mall at (0, 5), and then walks to a movie theater at (6, 5). after leaving the theater tommy walks to the store at (6, 0) before returning home. if each grid square represents one block, how many blocks does he walk?

Identify the expression equivalent to 4(x + x + 7) − 2x + 8 − 4 by substituting x = 1 and x = 2.