Posted by rawr... im a dinosaur.... rawr on Saturday, October 20, 2012 at 2:18am.
X- when hugo was 9 years old he was 56 inches
tall. hugo is now 12 years old and he is
62 inches tall. fins the percent of increase in
hugos height to the nearest tenth
X- a customer earned 3262.50 interest on a
9-month cd. how much was the opening
deposit
**total cost-- 1600 boat, 5.5% sales tax
X- cd player-- regular price, $89, sale price $80
**what is the total cost of a computer that had a
price of $1500 and sales tax of 7%
**a cd player costs $99 plus 5% tax.
what is the total price of the cd player
**find the percent of discount to the nearest
percent if a calendars regular price is $9.00
and the sale price is $2.25
** 1600 • 0.055 = 88
**1500 • 0.07 = 105
**99 • 0.05 = 4.95
**2.25/9 = 25%
X = I don't know please help.
Hugo:
12-9=3years
62-56=6inces
6 is what present of 56?
6 = x * 56
6/56=x
3/28=x
x=0.10714286
the the nearest tenth,
x=0.1
Interest:
x=opening deposit
y=interest rate (some decimal number or percent[which is then turned into a decimal])
$3262.50 over the course of 9 months is
3262.50/9=$362.5 per month
What is the interest rate of the equation?
x*y=362.5
x=362.5/y
Total Cost, Boat:
sales tax equations:
x=price
y=percent tax
z=final price
x+(x*y)=z
x*(1+y)=z
$1600, 5.5%
1600*.055=88
so sales tax is $88, plus(!) the cost of the actual boat so
1600+88=1688
total cost=$1688
CD Player1-Discount
Sales: % less/markdown
x=original price
y=percent discount
z=final price
x-(x*y)=z
x*(1-y)=z
x=$89, y=solve for, z=$80
x*(1-y)=z
(x*(1-y))/x=z/x
1-y=z/x
-1 = -1
-y=(z/x)-1
y=1-(z/x)
y=1-(80/89)
y=1-.8989
y=0.1011
10.11% discount
Computer
105+1500=1605
CD Player2-Tax,
4.95+99=103.95
Calendar
1-(2.25/9)=.75
discount is 75%
I gave you the equations, and the explanations, so hopefully, you will be able to get farther the next time. the answers you gave were correct, but you were missing the next step to the problems. If you need/want to, write the equations down, so that you have them if you ever need them. and if you learn how to "translate" English math problems to math equations (like I did in Hugo), word problems won't as difficult. It takes a while, and a lot of practice, and it helps if they are lined up the correct way (like how I wrote Hugo) and not backward (like they sometimes are) but practice and you'll get it.
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