HARD Math problem, please help
Favorites|Homepage
Subscriptions | sitemap
HOME > Mathematics > HARD Math problem, please help

HARD Math problem, please help

[From: ] [author: ] [Date: 11-10-06] [Hit: ]
Please help me choose a method! Here is the question.You start an exercise routine by lifting 3 lb and increasing the weight by 2lb per month. Predict how much weight you will lift after 5 months. Explain why you chose the method you used.-2lb x 5 = 1010 + 3 = 13 multipyling the weight by each month and adding the current weight gives you the answer.......
Hi there! I have been working forever on this question! My teacher already told us the answer was 13, but WHY? Please help me choose a method! Here is the question.

You start an exercise routine by lifting 3 lb and increasing the weight by 2lb per month. Predict how much weight you will lift after 5 months. Explain why you chose the method you used.

-
2lb x 5 = 10
10 + 3 = 13
multipyling the weight by each month and adding the current weight gives you the answer.. im prolly younger than you and i know this..

-
f(m) = 3+2m

The amount of weight you lift is a function of your starting weight, 3, plus 2 pounds for every month. To work out a function, you pick a value for m and substitute that value on the right whenever m appears, so 3+2*5 You could also write this as:

t = 3+2m

Where t is the total weight and m is the number of months.

So in 5 months, your weight will be

3+2(5) or 3+10 or 13

Finally you could say:

The total weight is 3 plus 2 for every month. Since it has been 5 months, the increase has been 5*2, or 10, plus the 3 I started with, for a total of 13.

Each of the above methods says the same thing.

-
this really isn't hard at all. this is a linear funtion, you are starting with 3 lb at 0, and every month you add 2. so lets give month a variable and call it m. the equation would be y= 2m +3

y is the weight you are lifting and m is the month. so if you are at month 0 plug 0 for m and you get y=3lb
and at month 5 plug 5 in m y = 2(5) + 3 and you get 13lb

-
Initial weight: 3lb
After 1st month: 3lb+2lb=5lb
After 2nd month: 5lb+2lb=7lb
After 3rd month: 7lb+2lb=9lb
After 4th month: 9lb+2lb=11lb
After 5th month: 11lb+2lb=13lb

-
Aha!

Well....

Use the equation: 3 + (2m) = w
m is equal to number of months
w is equal to weight, in pounds.


If you plug in the number of months into 'm,' you'll get the amount of weight lost!

-
The equation is a linear. Y represents for the weight after x months and remember you started with 3 lb

y = 2x + 3

after 5 months, so x = 5

y = 2*5 + 3 = 13.

-
I think you should give up on this problem and contemplate other options, such as stripping. Stripping is easier than math.

-
first month 3
second month 5
third month 7
fourth month 9
fifth month 11
after fifth month 13

-
3 lb + (2 lb/month) *(5 months) = 13 lb

-
Yeah it is 13. because if you multiply 2(5) equals 10 then add that by your first weight which is 3 you get 13.

-
3+5*2=13
1
keywords: HARD,please,problem,help,Math,HARD Math problem, please help
New
Hot
© 2008-2010 http://www.science-mathematics.com . Program by zplan cms. Theme by wukong .