Question

What is the closed linear form of the sequence 5, 7.5, 10, 12.5, 15,..?

Answer 1

first term =a1=5
common difference=7.5-5=10-7.5=2.5

so an=a1+(n-1)d

so
an=5+(n-1)*2.5
an=5+2.5n-2.5

an=2.5+2.5n

Answer 2

Answer:

C

Step-by-step explanation:

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