The cost of shipping a package in dollars, C, is given by the function C(w)= 20+5w/12, where w is the weigh in pounds of the package. How many more dollars does it cost to ship a 12 pound package than a 6 pound package?

Question

anonymous · Answer

i got 25 for the 12 pound package but... my answer for the 6 pound package came out as an odd fraction. not sure what happened.

anonymous · Answer

45/2 for 6 lbs   25 for 12 

22.5 for 6 lbs

anonymous · Answer

oh gosh... where did i go wrong on such a simple problem... XD

anonymous · Answer

try to express it as decimal because cost should be in dollars and cents anyhoo.

anonymous · Answer

use perenthesis  they are your friend :D

anonymous · Answer

ok :c i shall next time!

anonymous · Answer

20+5w/12

20+(5*w)/12

even tho i think both are the same it is better idea to put in the parenthesis :)

anonymous · Answer

mhmmm... it will be helpful to keep myself orderly when i write down the equations

anonymous · Answer

yup and since you are in a computer always  use parenthesis and seperate multiplications with a * 

so it is   5*w  not 5w it just makes it better for when you later plug it into google or maple  or what have you.

anonymous · Answer

right!