what the heck is it asking?
Time in Days, x 0 1 2 3 4 5
Sample Remaining (grams), U 500 255 130 66 34 17

Which equation best models this set of data where U represents the amount of sample remaining, in grams, at time x?
U = 26.7x2 - 223.9x + 481.1
U = 392 - 90.2x
U = 500(0.51)x
U = 500(0.49)x

Question

what the heck is it asking?
Time in Days, x	0	1	2	3	4	5
Sample Remaining (grams), U	500	255	130	66	34	17

Which equation best models this set of data where U represents the amount of sample remaining, in grams, at time x?
U = 26.7x2 - 223.9x + 481.1
 	U = 392 - 90.2x
 	U = 500(0.51)x
 	U = 500(0.49)x

shubhamsrg · Answer

its asking you that eqn in which for a particular value of x,,you get the respective value of U as in the table..

shubhamsrg · Answer

actually it wants an approximate eqn i guess..

anonymous · Answer

by adding them up or what?

shubhamsrg · Answer

adding what?? you'll have to check one by one..
am not getting what do you mean by "adding them or what" ?

anonymous · Answer

i checked one by one i dont get it  ,, thanks

shubhamsrg · Answer

well you wont get the exact value,,ofcorse its clearly evident,.you'll have to find the best eqn i.e, the one that gives closest values..
and your welcome! ;)