Erica knits 18 squares on Monday. She knits 7 more squares each day for the rest of the week. How many squares does Erica have on Friday?
7×4=28 28+18=46
i guss 53
http://www.mathsisfun.com/algebra/sequences-sums-arithmetic.html
a is 18
d is 7
its 46 because what soyna said was true and made a lot of sence
google sum of arithmetic sequence
Math is fun site is good for this
first time here, umm I guess also 46? ( still working on my test )
To find out how many squares Erica has on Friday, we need to add up the number of squares she knits each day.
First, let's calculate the number of squares she knits from Tuesday to Friday. Since she knits 7 more squares each day, we can express this as an arithmetic sequence:
7, 7 + 7, 7 + 7 + 7, 7 + 7 + 7 + 7
Using the formula for the sum of an arithmetic sequence, we can find the total number of squares she knits from Tuesday to Friday:
Sum = (n/2)(first term + last term)
= (4/2)(7 + (7 * (4-1)))
= (2)(7 + 7 * 3)
= 2(7 + 21)
= 2(28)
= 56
Since she knits 18 squares on Monday, to find the total number of squares she has on Friday, we add the squares she knits from Tuesday to Friday to the squares knitted on Monday:
Total squares = 18 + 56
= 74
Therefore, Erica has 74 squares on Friday.