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 Post subject: Math Essentials - Pages 67, 68, and 86Posted: Mon Jan 18, 2010 8:46 pm

Joined: Mon Jan 18, 2010 8:35 pm
Posts: 4
Can you please show the steps to solve the following questions:

Page 67, #5
Page 68, #3
(I know these are in the book, but I still can't quite figure it out. I must be missing something obvious)

Page 86 #'s 6 & 8

Thanks

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 Post subject: Re: Math Essentials - Pages 67, 68, and 86Posted: Tue Jan 19, 2010 7:45 am

Joined: Thu Feb 12, 2009 6:32 pm
Posts: 497
page 67 #5.

Year 0 -- home value x
year 1 -- home value 3x
year 2 -- home value 1/2 * (3x) (this is current value... 1.5x)
So we've made 50% above our initial investment of x.

Page 68 #3
12 / total = 75 / 100
(12, as a percentage of the total, is 75 as a percentage of 100)
12/t = 75/100
12/t = 3/4
Cross multiply
48 = 3t
divide both by 3
t = 16

page 86, #6
Cross multiply, first

7x = 3(x+12)
7x = 3x + 36 (don't forget to multiply the 3 by EVERYTHING in the parentheses)
subtract 3x from both sides
4x = 36
divide by 4
x = 9

page 86 #8
-3(14-2x) = -6 - 2x
-42 + 6x = -6 - 2x
Multiply a -1 through the whole thing.
42 - 6x = 6 + 2x
42 = 6 + 8x
subtract 6
36 = 8x
4.5 = x

Veritas Help

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