Which pair of lines are perpendicular? A. x - y = 7 and y = x + 3 B. y = -4r + 1 and 8x + 2y = -10 C. y = -8 and y = 2 D. x = 4 and y = -1

The amount of energy it takes to lift a box might be a function of which of the following

The triangles in the diagram are congruent. if mzf = 40°, mza = 80°, and mzg = 60°, what is mzb?

Out of $20$ creepy-crawly creatures in a room, $80\%$ are flies and $20\%$ are spiders. if $s\%$ of the total legs belong to spiders, what is $s$?