# 3 questions Math

18. What is the simpler form of the following expression?

(6x^3 - 1x +1) divided by (2x + 1)

-3x^2 + 2x - 1
3x^2 - 2x + 1
-3x^2 + 2x - 1
3x^3 + 2x - 1

19. Solve the equation.

1/2x + 14 - 9/x + 7 = -6

x = - 101/12
x = 101/12
x = - 67/12
x = 67/12

20. The time t required to drive a certain distance varies inversely with the speed, r. If it takes 4 hours to drive the distance at 40 miles per hour, how long will it take to drive the same distance at 55 miles per hour?

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3. 👁 734
1. Can someone help me?

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2. #18 - did you try this at the syntehtic division site I gave you?

You can see polynomial long division at calc101.com; click on the "long division" button.

#19
If you meant

1/(2x + 14) - 9/(x + 7) = -6
then that's just
1/(2x+14) - 18/(2x+14) = -6
-17/(2x+14) = -6
-17 = -6(2x+14)
-17 = -12x - 84
67 = -12x
x = -67/12

#20
The time t required to drive a certain distance varies inversely with the speed, r.

That means that tr is a constant
So, since t=40 when r=40, tr=160
When r = 55, then,

55t = 160
t = 2.9

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posted by Steve
3. omg thank you Steve, I posted anther post like this that asked for you but you don't have to answer it because you just did. I wish I could give you a reward like on open study. thank you.

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4. Steve you never gave me syntehtic division site before tho..

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5. the link worked thanls ;)

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6. thanks

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7. Oops. The synthetic division site was

http://www.mathportal.org/calculators/polynomials-solvers/synthetic-division-calculator.php

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posted by Steve

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