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August 30, 2015

Homework Help: 12th grade MATH

Posted by Blue on Monday, October 7, 2013 at 9:04pm.

1.)A picture 8 in. by 12 in. is placed in a frame which has a uniform width. if the area of the frame is equal to the area of the picture, find the dimension of the frame

(8+2x)(12+2x)-96 = 96
(8+2x)(12+2x)=96+96
96+4x(2)=192
4x(2)=192-96
4x(2)=96
x(2)=96/4
x/2=24/2
x=12

is it correct that the answer is 12? i'm not confident with my answer,please help!



Arman has 1160 annual income from bonds bearing 3% and 5 % interest. then he added 25% more of the 3% bonds and 40% more of the 5 % bonds, thereby increasing his annual income by 410. find his initial investment in each type
of bond


x=original 3% investment
y=original 5% investment

.03x+.05y=1160
.03(1.25x)+.05(1.4y)=1570
3.75x+7y = 1570


i don't know what to do next,please help!


thank you

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