Emma is attempting to finish her summer reading in a week. This will allow her to relax for the rest of the summer. On Monday, she read $(3 x^{2} + 5 x - 7)$ pages, Tuesday $(- 7 x + 9)$ pages, and Wednesday $(- 2 x^{2} + 3 x + 4)$ pages. In three days, how many pages did she read?

x^{2} - x + 6

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x^{2} + x - 6

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x^{2} + x + 6

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None of the above

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Solution

The correct option is C $x^{2} + x + 6$
$Given: - ------- -$
Let's make a table with Emma's daily page reading.
Total pages read in three days $=$ Pages read on Monday $+$ Pages read on Tuesday $+$ Pages read on Wednesday

$= (3 x^{2} + 5 x - 7) + (- 7 x + 9) + (- 2 x^{2} + 3 x + 4)$
Combining the like terms

$= (3 x^{2} - 2 x^{2}) - ----------- - + (5 x - 7 x - ------- - + 3 x) + (- 7 + 9 - ------ - + 4)$
Simpifyig the underlined terms

$= x^{2} + (- 2 x + 3 x) + (2 + 4)$

$= x^{2} + x + 6$

Therefore, Emma read $x^{2} + x + 6 - --------- -$ pages in three days.

Hence, option (c.) is the correct one.

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Emma is attempting to finish her summer reading in a week. This will allow her to relax for the rest of the summer. On Monday, she read (3x2+5x−7) pages, Tuesday (−7x+9) pages, and Wednesday (−2x2+3x+4) pages. In three days, how many pages did she read?

Emma is attempting to finish her summer reading in a week. This will allow her to relax for the rest of the summer. On Monday, she read $(3 x^{2} + 5 x - 7)$ pages, Tuesday $(- 7 x + 9)$ pages, and Wednesday $(- 2 x^{2} + 3 x + 4)$ pages. In three days, how many pages did she read?