When you add 2 negatives you get a negative for example -5+-15= -20 when you add a positive to a negative it increases the number for example -20+7= -13. Hope this helps
Numerator divided by denominator turns it into a fraction
First one-
9
2nd one-
the second page doesn't have a question
3rd one-
10.5
4th one-
10
Lets BC =x
8/5 = 32/x
8x =32 * 5
8x = 160
x = 160/8
x = 20
answer
BC = 20
