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7nadin3 [17]
2 years ago
12

Which is the directrix of a parabola with equation x2 = 8y?

Mathematics
1 answer:
olga_2 [115]2 years ago
4 0

Answer:

Y=-2

Step-by-step explanation:

You would use the vertex form to find the directrix

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2 years ago
Susan works as a tutor for $10 and hour, and as a waitress for $11 an hour. This month, she worked a combined total of 90 hours
uysha [10]

Answer:

\$(990-t)

Step-by-step explanation:

The correct question is

Susan works as a tutor for $10 and hour, and as a waitress for $11 an hour. This month, she worked a combined total of 90 hours at her two jobs. Let t be the number of hours Susan worked as a tutor this month. Write an expression for the combined total dollar amount she earned this month

Let

t -----> the number of hours that Susan work as a tutor

y ----> the number of hours that Susan work as a waitress

z ---> the combined total dollar amount she earned this month

we know that

t+y=90

y=90-t-----> equation A

we know that

The combined total dollar amount she earned this month is equal to the number of hours that Susan work as a tutor multiplied by $10 plus the number of hours that Susan work as a waitress multiplied by $11

z=10t+11y ----> equation B

substitute equation A in equation B

z=10t+11(90-t)

z=10t+990-11t

z=990-t

therefore

The expression for the combined total dollar amount is $(990-t)

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Divide numerator
and denominator by  x² :        6 y² / 24 x y²

Divide numerator
and denominator by  y² :           6 / 24x

Divide numerator
and denominator by  6 :          <em> 1 / 4x  </em>




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