Can anyone me with this?
4x^2-16x-84=0
don't tell me the answer, just show me step-by-step how to do it.

Find the lateral surface area plzzz

Find the sum of the first 8 terms of the following sequence. round to the nearest hundredth if necessary.

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?