1 2 3 4 p = 5 6 7 8
9 10 11 12

q= -1 -2
3 4
5 6
-7 8
can these two matrix be multiplied?
(I know how to I'm just not sure if I can multiply them)

Abicycle training wheel has a radius of 3 inches. the bicycle wheel has a radius of 10 inches.approximately how much smaller, in square inches and rounded to the nearest hundredth, is the area of the training wheel than the area of the regular wheel? *