Sn=n/2[2a+(n-1)d]
s7 means n=7
a7=7/2[2(13)+(7-1)(3)]=7/2(44)=154
Ans:C
Answer:
68
Step-by-step explanation:
4+8*8
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➷ Area = length x width
Convert all the values into just inches:
7'3'' = 87 inches
4'2'' = 50 inches
Substitute these values in:
area = 87 x 50
Solve:
area = 4350 in^2
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She could switch them around by grouping them into groups of 4s, 3s, 2s, or 5s.