martinmakenna2 martinmakenna2

30-12-2017
Mathematics

contestada

Find ∑(5 – 2k) when k goes from 2 to 7

Respuesta :

30-12-2017

Easiest way:
5-4=1
5-6=-1
5-8=-3
5-10=-5
5-12=-7
5-14=-9

Add these up:

30-54=-24

Answer Link

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If your heart beats 70 times per minute, everyday of the year, how many times does it beat in a year?