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2 years ago

7

What are the main units of length in the US.

1 answer:

arlik [135]2 years ago

3 0

Millimeters, centimeters, inches, yards, meters

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How many $20 checks would it take to pay an invoice for $280

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3 years ago

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3 years ago

Mike rides his horse with a constant speed of 14 km/h. How far can he travel in 3 1/2 hours?

Andreyy89

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2 years ago

A parabola can be represented by the equation y2 = –x. What are the coordinates of the focus and the equation of the directrix?

shutvik [7]

ANSWER

Focus:

$(- \frac{1}{4} ,0)$

Directrix:

$x=\frac{1}{4}$

EXPLANATION

The given parabola has equation:

${y}^{2} = - x$

We compare this to the general equation,

${y}^{2} = - 4px$

Comparing the coefficient of x, we have:

-4p=-1

$p = \frac{1}{4}$

The focus is (-p,0)

$(- \frac{1}{4} ,0)$

The equation of the directrix is

x=p

$x = \frac{1}{4}$

5 0

3 years ago

Read 2 more answers