Answer:
15
Step-by-step explanation:
4+3.85x=61.75
3.85x=57.75
x=15
n = -7,6
n(n+1)+3=45
distributive property: a(b+c) = ab+ac
n²+n+3 = 45
n²+n -42 = 0
factor now
(n+7)(n-6) = 0
0 = (x + 1)(x + 1)
Therefore
x + 1 = 0
x = -1 (twice)
(-1, 0), (-1, 0)
23 .7 ruim
57.2 sol
32 .8 mais ou menos
tchau bj
