Substituindo x por -7 na expressão algébrica do item a) obtemos o valor numérico: a) 21
b) - 21
c) - 7
d) - 16
e) 16

Two positive integers are 3 units apart on a number line. their product is 108. which equation can be used to solve for m, the greater integer? m(m – 3) = 108 m(m + 3) = 108 (m + 3)(m – 3) = 108 (m – 12)(m – 9) = 108

3x + 4y = 5 x- 3y = -7 solve by substitution

Five friends found a dollar on the ground and decided they each should get 1/5 of it. what amount of money will each friend get? $0.05 $0.20 $0.30 $0.80