2/5. Divide both numbers by 5 and there you go
10^2=100.
100x18.72=1872
10 to the second power is 100
when you multuply by 100 you basically just move the decimal place forward 2 decimal places. Essentially the same as:
100x18.72
10x187.2
1x1872
1. 45.8-7.48=38.32 in
2. 5/6-3/4=10/12-9/12= 1/12 miles farther
Answer:
1) 2 1/4 + 5 1/2 + 1/4 = 8
2) 9 1/2 - 3 1/2 = 6
3) 7 x 13 = 91
4) 17 / 2 = 8 1/2
Step-by-step explanation:
First square both sides to get:
c + 22 = (c + 2)^2
or
c + 22 = c^2 + 4c + 4
Move the terms on the left side to the right side:
c^2 + 3c - 18 = 0
Factor to get:
(c + 6) * (c - 3) = 0.
The solutions are c = -6 and c = 3.
Check to see if these answers work by plugging them into the original equation:
c = -6:
sqrt (-6 + 22) ?= -6 + 2
But, -6 + 2 is a negative number, and you can't get a negative from a square root. So, -6 is extraneous.
c = 3:
sqrt (3 + 22) ?= 3 + 2
5 = 5. So, 3 works.
The answer is: B
