# Math

2x^2+9x-5 is the area of a rectangle and one side of the rectangle is x+5, What is the other side of the rectangle?

A volume of a cube is 15625cm cubed. What is the length from point A to B in the cube?
Point A is on the front bottom right corner and point B is on the the other side of the cube on the top left side so the line is like this: \

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3. 👁 173
1. well, it has to be a x + b to get a quadratic for the area

(ax+b)(x+5) = 2 x^2 + 9 x -5
so divide

********* 2x -1
*******________________
(x+5) | 2 x^2 + 9 x - 5
********2 x^2 + 10 x
--------------------------
****************-x - 5
****************-x - 5
Remainder = 0, (good thing)
so
The other side is (2x-1)

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posted by Damon
2. Thank u so much but do u get the second question? Cause I'm really stuck on it

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posted by Miley
3. side = s
diagonal across bottom = s sqrt 2
then diagonal above that to upper corner
sides = s sqrt 2 and s
so
d = sqrt (2 s^2 +s^2) = sqrt (3 s^2)
= s sqrt 3

here s = 15625^(1/3) = 25 remarkably enough

so our d = 25 sqrt 3 = 43.3

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posted by Damon
4. I can only do one at a time, very old and weak brained.

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posted by Damon
5. OMG thank u so much!!! Though I have 1 more question sorry. The cost of jewelry is the fixed amount + % of value. It costs \$32 to insure \$1000 of jewlerry. And it costs \$44.50 to insure \$3500. What is the fixed amount to insure?

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posted by Miley
6. C = !@#\$%^& v
32 = !@#\$%^& (1000)
44.5 = !@#\$%^&(3500)
------------------ subtract
-12.5 = -2500 k
k = .005 or .5 %
then go back with that k
32 = f + 5
f = 27

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posted by Damon
7. Thank u so much :):):):)

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posted by Miley

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