X = 15
X + 90 = 7x
X = 7x - 90
X - 7x = -90
-6x = 90
Divide both sides by -6
X = 15
Answer:
Step-by-step explanation:
f(-1)= -3(-1)+1 (you basically just sub in the -1 whenever you see an x. Therefore f(-1) = 3+1 = 4
Answer:
6 weeks
Step-by-step explanation:
100 + 5x = 10 + 20x
15x = 90
x=6
3.2(2) is same as 3.2*2 which is equal to 6.4