Question...Sleep is known to affect student grades. Kirsten is conducting a study in a local high school using two treatments on
1 answer:
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ANSWER
80%
EXPLANATION
Donovan got 20 questions correct and 5 questions incorrect.
This means that the total number of questions he attempted in the test is the sum of correct and incorrect questions:
Total = 20 + 5
Total = 25
To find the percentage of correct answers, we have to divide the number of correct answers by the total number of questions attempted and multiply by 100 (per cent).
That is:
That is the percentage of correct answers.
The formula for the area of a sector in radians is 
, where theta is the angle in radians. For us, the formula looks like this: 
. Doing all the multiplication on that gives us 
. Multiplying in pi and rounding to the nearest tenth gives us an area of 76.3 meters squared. You can use the formula for the area of a sector with the angle in degrees as well. Just replace the 360 degrees with 2pi and it works the exact same way.