Solve the application problem.A freight train traveled at a speed of 50 mph for 3 hours, then stayed at a station for 1 hour, and then traveled at 30 mph for 2 hours. Draw a graph of distance versus time to match the description of the train's trip.
A. 
B. 
C. 
D. 
Answer: C
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Add. 3 + 2 + (-6)
A. -5 B. 7 C. 11 D. -1
Use transformations to graph the function.y = cos (
x)
A. 
B. 
C. 
D. 
Find the indicated sum.-3 + 1 + 5 + 9 + 13 + . . . + (4n - 7)
A. n(2n - 5) B. n(2n + 5) C. n(4n + 7) D. n(4n - 7)
Solve the problem.Linda invests src="https://sciemce.com/media/4/ppg__tttt0525191057__f1q144g6.jpg" alt="" style="vertical-align: -4.0px;" /> and 
for one year. Part is invested at 
, another part at 
, and the rest at 
. The total income from all 3 investments is 
. The combined income from the 
investments is the same as the income from the 
investment. Find the amount invested at each rate.
A. $10,000 at 5%; $10,000 at 6%; $5000 at 8%
B. $5000 at 5%; $10,000 at 6%; $10,000 at 8%
C. $8000 at 5%; $10,000 at 6%; $7000 at 8%
D. $10,000 at 5%; $5000 at 6%; $10,000 at 8%