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3 years ago

If 3 pounds of chocolate cost $25.50 how many pounds can you buy for $42.50

2 answers:

8 0

To solve this, write a proportion of Pounds to Cost:
Pounds: 3 x
Cost: 25.50 42.50

Cross multiply 3 and 42.50, this gives you 127.5
Then, divide by 25.5
This gives you 5.
You can buy 5 pounds with $42.50

irga5000 [103]3 years ago

5 0

Hnmm what's simple, follow this structure- always find the rate(by dividing) first find the rate of 3 pounds and 25.50
3pounds=. 1pound=?
25.50. Try for 1LBS So in order to get this divide 3 by the number that gets it 1 (for one pound)

Which is 3 so 3pounds divided by 3 = the one pound you want. So now divide the 25.50 by 3 to get 8.50. Now this is the problem
1pound=so ____pounds=
8.50. 42.50
All you have to do is divide 42.50 by 8.50 to get 5 FIVE POUNDS EQUAL 42.50 your welcome, I think :)

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We have been given a function $f(x)=2x^3+3x^2-336x$ . We are asked to find the interval on which function is increasing and decreasing.

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Let us find 2nd derivative.

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