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2 years ago

A cyclist travels 5 miles in 15 minutes. What is her average speed in mph?

Mathematics

1 answer:

Ber [7]2 years ago

6 0

S=d/t

15 minutes = 0.25 hour

S=5/0.25

S= 20 miles per hour

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3 years ago

Find the present value of $ 3,000 at a simple interest rate of 6 % in 9 years ?

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Step-by-step explanation:

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3 years ago

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3 years ago

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Ac method for x^2+20x-8=0

yanalaym [24]

<h2>Explanation:</h2><h2></h2>

By using quadratic formula:

$x_{1,\:2}=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$

$\quad a=1,\:b=20,\:c=-8$

$x_{1,\:2}=\frac{-20\pm \sqrt{20^2-4\cdot \:1\left(-8\right)}}{2\cdot \:1}$

$x=\frac{-20+\sqrt{20^2-4\cdot \:1\left(-8\right)}}{2\cdot \:1}:\quad 2\left(3\sqrt{3}-5\right)$

$x=\frac{-20-\sqrt{20^2-4\cdot \:1\left(-8\right)}}{2\cdot \:1}:\quad -2\left(5+3\sqrt{3}\right)$

So the solutions are:

$\boxed{x=2\left(3\sqrt{3}-5\right),\:x=-2\left(5+3\sqrt{3}\right)}$

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3 years ago