Step-by-step explanation:
i)
ii)
iii)
Answer:
4
19 = 7 + 3r
12 = 3r
4 = r
18.1 is the answer. I am glad I could help.
22 days
55 divided by 2.5=22 days
4(-3 + -2d) = 12
(-3 * 4 + -2d * 4) = 12
(-12 + -8d) = 12
-12 + -8d = 12
-12 + 12 + -8d = 12 + 12
-12 + 12 = 0
0 + -8d = 12 + 12
-8d = 12 + 12
12 + 12 = 24
-8d = 24
d = -3