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svet-max [94.6K]
4 years ago
15

1. the sum of the first n odd positive integers is 64. what is the value of n ?

Mathematics
1 answer:
77julia77 [94]4 years ago
3 0

Step-by-step explanation:

1. 64=1+3+5+7+9+11+13+15 that is a total of 8 odd numbers so n=8

2.((new-old)/old)×100%=percentual difference

so ((new-$55)/$55)×100%=20%

new-$55=$55×0.2

new=$55+$55×0.2=$66

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