Answer:
Result at time x = 4 seconds the soccer ball hit the ground.
Step-by-step explanation:
At the moment just before the ball is kicked, it is on the ground and so the height f(x) is zero meters. After the kick, the ball goes through the air and it's path can be described by a (mountain) parabola.
So lets see after how many second (x) the height = 0 once again.
f(x) = 8x-2x^2
f(x) = 0
8x - 2x^2 = 0
Try to write the formula in two terms
-2x * (x - 4) = 0
When a product of two or more terms equals zero, then at least one of the terms must be zero.
Now solve each term = 0 separately, meaning, solve as many equations as there are terms in the product.
Any solution of term = 0 solves product = 0.
Solve the first term:
-2x = 0
Multiply left an right from the = singn with the factor -1 gives this outcome:
2x = 0
x = 0
Solve the second term:
x-4 = 0
x = 4
Result at time x = 4 seconds the soccer ball hit the ground.
x = 4
x = 0
Answer: I think it is b
Step-by-step explanation:
You need to rise divided by the run. Another way to put it is
m = (y2 - y1)/(x2 - x1)
Take your points and plug them in
m = (2 - 9)/(-5 - 3) = (-7)/(-8) = 7/8 is the slope
Answer:
Distance between two places=120 km
Step-by-step explanation:
Time= 2 hrs 30 min
=(2*60)min+30min
=120min+30min
=150min=150/60 hr
= 5/2 hr
Speed = distance /time
= (120/5/2)km/hr
=(120×2/5)km/hr
=(240/5)km/hr
= 48 km/hr
New time = 2 hr 30min-30min
= 2hr
Distance =120km
Speed = Distance /time
=120/2 km/hr
= 60 km/hr
Increase in speed=(60-48)km/hr
=12km/hr
Another way to show :
Distance = 120km
speed=Distance/time
=120/2.5=48 km/hr
New speed=120/2=60 Km/hr
change inspeed=60-48=12km/hr
