AP - sum15

Calculate the sum of the first 15 terms of the arithmetic sequence if a1=5, d=-3

Final Answer:

s15 =  -240

Step-by-step explanation:

a1=5 d=3 n=15  a15=a1+14 d=5+14 (3)=37  s15=n 2a1+a15=15 25+(37)=240



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You need to know the following knowledge to solve this word math problem:

algebraarithmeticbasic operations and conceptsnumbersGrade of the word problem

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