Question

LAST QUESTION.....The position of an object moving in a straight line is given by s=2t^2-3t, where s is the distance in meters and t is the time in seconds the object has been in motion, How long,(to the nearest tenth) will it take the object to move 14 meters?

Answer 1

is t=7/2

Answer 2

So\[14=2t^2-3t \rightarrow 2t^2-3t-14=0\rightarrow 2t^2-7t+4t-14=0\rightarrow \]\[(t+2)(2t-7)=0\rightarrow t=-2 or t=7/2\]Since the model does not apply for times less than zero, the solution is t=7/2.

Answer 3

Sorry one more then im done,
A merchant has coffee worth $20 a pound that she wished to mix with 70 pounds of coffee workth $80 a pound to get a mixture that can be sold for $40 a pound. How many pounds of the $20 coffee should be used??

Answer 4

20x + (80)(70) = 40 (70+x)

Answer 5

2800 = 20x
140 = x

Answer 6

thank you

Answer 7

No sweat.