Solve for x. Check your answers.5 = x + 18
A. x = -13
B. x = 13
C. x = 90
D. x = 23
Answer: A
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State whether the parabola opens upward or downward.f(x) = -6x2 + 3x + 7
A. Upward B. Downward
Find the integral. 
What will be an ideal response?
Solve the problem.Three trains - one eastbound, one westbound, and one northbound - leave a city at the same time. The speed of the northbound train is 20 miles per hour greater than the speed of the eastbound train. After 3 hours, the distance between the westbound train and the eastbound train is 300 miles. Twice the speed of the westbound train is 60 miles per hour more than the speed of the northbound train. Find the speeds of the three trains.
A. eastbound, 60 mph; westbound, 60 mph; northbound, 40 mph B. eastbound, 30 mph; westbound, 70 mph; northbound, 60 mph C. eastbound, 50 mph; westbound, 60 mph; northbound, 70 mph D. eastbound, 40 mph; westbound, 60 mph; northbound, 60 mph
Evaluate. Simplify and adjust the mixed number if the answer contains an improper fraction.1
+ 7
A. 5
B. 8
C. 9
D. 9