Answer:
-4
Step-by-step explanation:
Answer:

Step-by-step explanation:
we have

step 1
Exchange the variables (x for y and y for x)
so

Isolate the variable y
step 2

subtract 3 both sides

step 3
square root both sides

step 4
Adds 2 both sides

step 5
Let


Answer:
so it would be 2/1 hours because fully charged is 3 hours
Choice B
Exactly 1 solution
Because:
First we must disrupte
3y+27=12y+13
Next we switch one number to the other side
27=9y+13
Now we must switch the other number
14=9y
Now we must solve by dividing 14 by 9
y=1.555
This is one solution, so we now have our answer.