tytiuna
24.03.2021 •
Mathematics
What is length a to the nearest tenth?
10 m
34
a
O 47.1
O 23.6
O 20.1
O 10.5
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Ответ:
so
aritmetic sequence
first term is a1
common difference is d
an=a1+d(n-1)
first term is 5 planks
increases by 4 each day
an=5+4(n-1) is the equation for how many he will do on the nth day
12th day
a12=5+4(12-1)
a12=5+4(11)
a12=5+44
a12=49
49 walking planks