Posted by Johnny on .
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,
New rectangle has area of
(9+x)(5+x)
so ...
(9+x)(5+x)  45 = 120
x^2 + 14x  120 = 0
(x + 20)(x6) = 0
x = 20 (silly) or x = 6
new rectangel is 11 by 15
check:
new rect. = 11x15 = 165
old rect. = 5x9 = 45
increase = 16545 = 120 Checks! 
algebra 
Paul,
What is 7/12 as a percent and decimal???

algebra 
Kathleen,
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,
Thank You Kathleen your a life saver

algebra 
cheryl,
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