Answer:
I believe the answer is B.
Step-by-step explanation:
If you look at the graph points for the last three hours it continues downword at the same rate.
The final cost is 28249*(1+3.49/100)^5=33534.74
<u>9</u><u> </u><u>is</u><u> </u><u>a</u><u> </u><u>solution</u><u>.</u>
Solution given:
2x+10=28
subtracting both side by 10
2x+10-10=28-10
2x=18
dividing both side by 2
2x/2=18/2
x=9
3*boys=2*18
3*boys=36
boys=12
12+18=30
total number of students: 30
0.02116402116
Or otherwise written as- 0.211
