Mathematics
shawta
7

Erica Nits 18 squares on Monday she knits seven more squares each day from Tuesday through Thursday how many squares does Erica on Friday

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(1) Answers
AyeeAngel

Monday: 18 squares Tuesday: 18 + 7 = 25 squares Wednesday:25 + 7 = 32 squares Thursday: 32 + 7 = 39 squares Friday: 39 + 7 = 46 squares. This is called an arithmetic sequence. There is a faster way to do this with a formula. The formula is a(n) = a1 + d(n-1), where a1 is the first term (18 in this case), d is the common difference, what you add or subtract to get the next number (7 in this case), n is the term you want to find (5). Plugging in our info into the equation, a(n) = a1 + d(n-1) a(5) =18 + 7(5-1) a(5) = 18 + 28 a(5) = 46

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