Easy, 100 x 3 is 300 pounds, 5 x 3 is 15, so 15 pounds. :)
It could be 443, try simplifying to the nearest hundreaths, hope this helps!
8 + -3 * 2m + (-3)(-5) = 8 + -6m + 15 = 8 + -6m + 15 = (-6m) + (8 + 15 ) = -6m + 23
so the answer is -6m + 23
Check the picture below
area of a triangle is 1/2 bh