Question & Answer choices inside in a screenshot.

Question

anonymous · Answer

attachment

campbell_st · Answer

so which part are you having problems with..?

anonymous · Answer

the whole thing. i dont get it at all.

campbell_st · Answer

ok... so make a table of values

t:  0   :  1:       2:       3:     4:    :5 :  6:  7:  8
-----------------------------------
s: 15  : 37.4 : 46.6   : 

so keep substituting values of t to calculate s. 

plot the points on the number plane

and extending the table you will know the value of s when t = 8. 

remember that the value of s needs to be multiplied by 1000 to get the dallar value... so that eliminates A and C as answers

hope it helps