Answer:
Step-by-step explanation:
( 5 - x) ( 4-x )
=5(4-x)-x(4-x)
=20-5x-4x+x^2
=x^2-9x+20
hope it helps...
Answer:
1225
Step-by-step explanation:
divide by 4 because a square has 4 sides
Answer:
B. x = -1 and x = 3
Step-by-step explanation:
The zeros of a quadratic function are where the lines insect the x-axis. This means that the y value will always be 0 and the x value will be any real number
Answer: 75% of 6th Grade Students
Step-by-step explanation:
This sample makes the most sense because it is a majority of everyone, not just a majority of certain people. Also, Mountain School would get fewer complaints from other people if they went with a majority of 75%. Finally, running sports usually cost less then other sports.
If the take the origin as the starting point of the ball, then the vertex would be (4,28) and the parabola would be facing downwards. Using the general form of the parabola which is (x-h)^2 = 4p(y-k) where h and k are taken from the coordinate of the vertex (h,k).
So, the equation would be, (x-4)^2)=4p(y-28). To determine 4p, we can substitute either of the two points: (0,0) or (0,8). The second coordinate is taken from the given that the ball covers a distance of 4 ft after it reaches a maximum height. The total distance traveled by the ball is twice that, which is 8 ft.
After substituting, 4p = -4/7. Plugging this into the equation and after expanding and simplifying, the equation of the ball's trajectory is:
y = (-4/7)x^2+14x