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Dafna11 [192]
3 years ago
8

If marisol got 68 answers correct and her total is an 85, what was her test score?

Mathematics
2 answers:
denis23 [38]3 years ago
4 0
Divide 68 by 85 = is .8 which is 80%
aleksandr82 [10.1K]3 years ago
4 0
So 68 is their score out of 85
68/85
And her percent should be out of 100%
So you would use cross multiplication
68/85 = x/100 ; let x represent her test score
68/85 = x/100 -> 68(100)= 85x
6800= 85x
Divide by 85 on both sides
6800/85 = 85x/85
80=x so she score was 80%
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Can someone help me with number 8 please? Thank you.
Naddik [55]
Answer: -4 \le x \le 5
Note: to write the domain in interval notation, you'd write [-4,5]
if you need the domain in set-builder notation, then you'd write \left\{x|x\in\mathbb{R}, \ -4\le x\le 5\right\}

------------------------------------------------------------------------------

Explanation:

The domain is the set of possible x input values. Look at the left most point (-4,-1). The x coordinate here is x = -4. This is the smallest x value allowed. The largest x value allowed is x = 5 for similar reasons, but on the other side of the graph.

So that's how I got -4 \le x \le 5 (x is between -4 and 5; inclusive of both endpoints)

Writing [-4,5] for interval notation tells us that we have an interval from -4 to 5 and we include both endpoints. The square brackets mean "include endpoint"

Writing \left\{x|x\in\mathbb{R}, \ -4\le x\le 5\right\} is the set-builder notation way of expressing the domain. The x\in\mathbb{R} portion means "x is a real number"

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