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dezoksy [38]
3 years ago
11

Find each rate and unit rate 420 miles in 7 hours

Mathematics
1 answer:
Anon25 [30]3 years ago
4 0

the unit rate is 60 mph

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What is the sum of the arithmetic sequence 3, 9, 15..., if there are 36 terms?
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We know that
the formula of the <span>the sum of the arithmetic sequence is
Sum=n*(a1+an)/2

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a1=3
a36=?

find a36
an=a1+(n-1)*d

for n=2   a2=9
9=3+(2-1)*d----> 9=3+d----> d=6
so
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a36=a1+(36-1)*6----> a36=3+35*6----> a36=213

</span>Sum=n*(a1+an)/2-----> 36*[3+213]/2----> 3888

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