I need help with this and please tell me how you got it
1 answer:
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Answer:
<u>15 students</u> purchase their lunches in the cafeteria.
Step-by-step explanation:
Given:
At eastwood middle school, 25% of the 60 students Mrs. Wade teaches buy their lunches in the cafeteria.
Now, to find the students purchase their lunches in the cafeteria.
Total students = 60.
Percent of students who buy lunches = 25%.
So, to get the number of students who buy their lunches in the cafeteria:
<u><em>25% of 60.</em></u>
Therefore, 15 students purchase their lunches in the cafeteria.
Answer:
Step-by-step explanation:
First we need to make sure that the leading coefficient is a 1. Ours is a 4, so we need to factor it out, leaving us with
To complete the square, take half the linear term, square it, then add it to both sides. But don't forget about that 4 hanging around out front, refusing to be ignored. Our linear term is 18. Half of 18 is 9, and 9 squared is 81. Add 81 into the parenthesis, but what we REALLY added in was 4*81 which is 324:
To solve this, we need to get the x terms all by themselves. So let's divide both sides by 4 to get
The process of completing the square created a perfect square binomial on the left. We will state this binomial now:
We isolate the x term by taking the square root of both sides:
x - 9 = ±9
From that we have 2 equations:
x - 9 = 9 and x - 9 = -9
Which means that x = 18 or x = 0