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Help me with question 4 and 5

Help me with question 4 and 5-example-1

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I know that the answer is D. 25 pages is the constant (number of pages she has written), and the variable is the number of days, being 4d. Add 25 pages + the 4 pages a day(d=variable days) = 225.

I am not familiar with the grid below that, however. But the first part is:
25 + 4d = 225.
User Melanie
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