B. The age of the car vs. The value of the car
Answer:
Step-by-step explanation:
<u>Solving by completing square</u>
- -14 + x^2 = 5x
- x^2 - 5x - 14 = 0
- x^2 -2*2.5x + 6.25 - 20.25 = 0
- (x -2.5)^2 = 20.25
- (x - 2.5)^2 = 4.5^2
- x - 2.5 = 4.5 ⇒ x = 7
- x - 2.5 = -4.5 ⇒ x = -2
Answer:
she has a total of 140 coins
Step-by-step explanation:
x is coins in total
5/100 times x = 7
0.05 times x = 7
x = 7/0.005
x = 700/5
divide that you get 140
