Posted by **Johnny** on Wednesday, March 24, 2010 at 8:11pm.

The sides of an rectangle was 5cm by 9cm. When both dimension were increased by an equal amounts the area of the rectangle increased by 120 cm^2 find the dimensions of the new rectangle.

- algebra -
**Reiny**, Wednesday, March 24, 2010 at 8:19pm
New rectangle has area of

(9+x)(5+x)

so ...

(9+x)(5+x) - 45 = 120

x^2 + 14x - 120 = 0

(x + 20)(x-6) = 0

x = -20 (silly) or x = 6

new rectangel is 11 by 15

check:

new rect. = 11x15 = 165

old rect. = 5x9 = 45

increase = 165-45 = 120 Checks!

- algebra -
**Paul**, Wednesday, March 24, 2010 at 8:20pm
What is 7/12 as a percent and decimal???

- algebra -
**Kathleen**, Wednesday, March 24, 2010 at 8:32pm
Divide 7 by 12 to get the decimal.

7/12=0.5833 (3 repeating)

Multiply by 100 to get percent.

58.33% (3 repeating)

- algebra -
**Paul**, Wednesday, March 24, 2010 at 9:02pm
Thank You Kathleen your a life saver

- algebra -
**cheryl**, Wednesday, March 31, 2010 at 1:22am
suppose that the height of an object shot straight up is given by

h=544t -16t^2. h= feet and t= seconds

Find the maximum height and the time at which the object hits the ground

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