Subject: Extra Credit Problems
Date: 14 Apr 99 13:56:16 -0500
My teacher has given me 5 extra point questions. I have figured out two, but i need a little assistance with 3 others, could you help me with:
Here are a few ideas.
For problem number 1 the stablehand is to receive $240 at the end of 1 year so that is $20 per month. Thus at the end of 7 months she is owed 7x$20 = $140 and seven twelths of a horse. Since she only received $100 in cash she must have used $40 to buy the remaining five twelths of the horse.
For 2. if the roots of x2 + bx + c are pi and the square root of 2 then (x - pi) and (x - the square root of 2) are factors of x2 + bx + c. Multiply (x - pi) by (x - the square root of 2) to try to determine b and c.
I don't think that you can use similar triangles in 4. You need somehow to use the fact that the curve is a parabola. Draw the parabola in the plane with the y-axis as the axis of symetry and the vertex at (0,15). Now can you determine the equation of the parabola to solve your problem?
I hope this helps
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