Engineers built an arch bridge across a river. The arch bridge makes a parabola shape that has the equation

y=-0.1(x – 5)2 + 12, where x and y are measured in

meters. If the bridge makes contact with both banks at a height

of 4 meters, how long is the distance between the two banks

of the river where the bridge is? Round your answer to the

nearest whole number.

meters

You drop a rubber ball off the roof of a 50 meter high building onto a paved parking lot. it bounces back up with every bounce, but not quite all the way back up to you. after the first bounce it bounces back only 80 percent of the distance it was dropped from. the pattern continues, meaning after every bounce it comes up to just 80 percent of the previous maximum height. so if before the first bounce the height is 50 meters, what height does the ball reach after the fifth bounce? round your answer to one decimal place and chose the correct response from the choices below:

Idon’t understand! use slope intercept form to solve: through: (2,5) slope= undefined

Find the area of the triangle formed by the origin and the points of intersection of parabolas y=−3x^2+20 and y=x^2−16.