mathlab

A patio measures 12 feet by 14 feet. How many 8-inch-square paving stones are needed to pave the patio? A. 21 B. 252 C. 378 D. 168 my answer is B, but the right answer is C? can someone explain that to me thanks

Solve for x in the equation (x − 7)^2 − 4 = (x + 1)^2.

78/132 = .5909 how do i get the answer here without using calculator? any tips?

follow up quesiton 11/4 or 2.75 how do u convert this without using calculator?

i did the long division but my answer doesn't make sense. i got 1.7 and i stopped from there can you explain how should i start it?