you dont use the distributive property
(8x-1)(7x-1)
then you foil it and combine like terms
I got -6/25 Sorry I can't really explain this try web2.0calc.com it helps alot with math.
So the easiest way to solve this is to use the straight line provided .
180=90+61+x
180=151+x
29=x
The right answer is A ! :)
The function d(t) represents the distance traveled by the train after t hours. d(5) is the total distance traveled by the train after 5 hours, which means 6:00 pm. The d(2) is the total distance traveled by the train after two hours, 3:00 pm. The expression d(5) - d(2) represents the total distance traveled by the train from 3:00 pm to 6:00 pm or for traveling at a constant speed for 3 hours.
