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never [62]
3 years ago
13

A study of high school students in a college preparatory curriculum was designed to measure the effect of time spent doing homew

ork to grades in courses.
What is the dependent variable?

A.
time spent on homework

B.
type of curriculum

C.
grades in courses

D.
age of students
Mathematics
1 answer:
sammy [17]3 years ago
6 0
C. grades in courses because it depends on how much the students study to get their grades
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How do work this out
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We can factor this by using grouping. Take the leading coefficient and multiply it by the constant. In this case we get 5*-7 = -35. 

Now we need 2 numbers that add to 2 and multiply to be -35. The numbers are -5 and 7.

So split the 2r into these two terms and group.

(5r^2 - 5r) + (7r - 7)

Factor both groups.

5r(r-1) + 7(r-1)

The factors of (r-1) can be added together to get the answer.

(r-1)(5r+7)
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Step-by-step explanation:

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