2 years ago

A family drives 412 miles in 110 of an hour. What is their rate of speed in miles per hour?

Mathematics

1 answer:

Bad White [126]2 years ago

8 0

Answer:

3.74 mph

Step-by-step explanation:

412÷110=3.74

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Enter the finite geometric series from its given description, and then enter its sum.

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Answer:

$a_n= 4(-5)^{(n-1)}$

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Step-by-step explanation:

a = 4

r = -5

geometric series: $a_n=ar^{(n-1)} = 4(-5)^{(n-1)}$

Determine which term = -12500:

$a_n=-12500$

$4(-5)^{(n-1)}=-12500$

$(-5)^{(n-1)} = -3125$

$(5)^{(n-1)} = 3125$

$(n-1)ln(5) = ln(3125)$

$n-1 = ln(3125)/ln(5) = 5$

$n = 5 + 1 = 6$

$a_6=-12500$

Using geometric sum series formula: $S_n=\frac{a(1-r^n)}{1-r}$

Therefore, $S_6=\frac{4(1-(-5)^6)}{1-(-5)} =\frac{-62496}{6} =-10416$

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