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Math Applications
Solutions and Notes
11. a. arithmetic sequence
b. Each trial, total miles
decreases by 39 so
Yvonne’s mileage should
be 388 – 39 = 299 miles
for a 7th trial.
c. S n
= n 533 260
2 ( + )
3,172 = n 2 ( 793)
3,172 = 396.5n
8 = n
d. The number of mpg
decrease by 3 miles in
each trial. The number
of mpg multiplied by the
number of gallons the tank
holds gives the total miles
traveled.
5
∑
n=
0
13( 41−
3n)
5
∑13( 41−
3)
=
0
Math Applications 427