Given the following matrices, find 3a - 2b. (hint: find 3a and 2b first and then subtract.)
a= [1 3] b=[4 9] [ 5 -2 1] [-1 2 1
[ 5 2] [0 3] c= [ 0 -8 6] d= [6 -6 4
[-4 4 -4] [2 -8 3

Which inequality comparing two of the expressions is true when 0.7 < x < 0.9

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.

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? *