Answer:
B. He added 5 to each side of the equation.
Step-by-step explanation:
B. He added 5 to each side of the equation.
To find out how long it will take a phone to charge 100% if it charges 3% every 5 minutes, you have to put it in a fraction.
3/5
3 is the percent charged and 5 is the time.
You have to find out what 100 divided by 3 is. The answer is 33.3.
So,
3/5 times 33.3 is equal to 99.9/166.5.
It will take 166.5 minutes for the phone to charge to about 100%.
hope it helps.
can you choose mine as the brainliest answer
Trigonometry as taught is mostly about memorizing two lousy triangles, namely half a square and half an equilateral triangle. This one is half an equilateral triangle.
The respective opposite sides of the 30/60/90 triangle are in ratio 
A sine of √3/2 is an opposite of √3 and a hypotenuse of 2, so opposite and hypotenuse of the 60 degree angle. (It's the mama bear, in the middle, just right.)

In the end you just have memorize the two tired triangles of trig.