A diesel train traveled to the repair yards and back. It took two hours longer to go there than it did to come back. The average speed on the trip there was 70 km/h. The average speed on the way back was 80 km/h. How many hours did the trip there take? A) 15
B) 16
C)25
D) 10

How do you find the area of a triangle

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .