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# Tutor profile: Rachel D.

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Rachel D.
College Student Looking to Tutor
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## Questions

### Subject:Pre-Algebra

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Question:

A number plus -44 is 46. What is the number?

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Rachel D.

To find the missing number, you must set up an equation. Have x equal the number you are trying to find. So x + (-44) = 46. since the 44 is negative, you must add it to the other side to get x=90. To check yourself, plug x back in the equation: 90-44=46, 46=46

### Subject:Basic Math

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Question:

Round 6.724 to the nearest hundredth.

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Rachel D.

Since the hundredth place is the second decimal place, you must look at the next number which is a 4. Since 4 is less than 5, you must round down to get 6.72. If the next number was greater than or equal to 5, the answer would be 6.73.

### Subject:Algebra

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Question:

Find the equation of the line that passes through the points (-1 , -1) and (-1 , 2).

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Rachel D.

We first must find the slope m. m = (y2 - y1) / (x2 - x1) = (2 - -1) / (-1 - -1) = 3 / 0 The slope is undefined (when the denominator is 0) which means the line is perpendicular to the x axis. Since both points have x coordinates equal to -1, the equation is given by: x= -1.

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