You can model an arch at your school using the equation y=−0.8(x−5)(x+5), where x and y are measured in feet. The x-axis represents the ground. Find the width of the arch at ground level.

The width of the arch at ground level is ___ feet.

10 ft

Step-by-step explanation:

At ground level, y = 0.  Setting −0.8(x−5)(x+5) = to 0, we get x = 5 and x = -5 as solutions.  The arch touchs the ground at x = -5 and x = 5 ft.

The width of the arch at ground level is 5 - (-5), or 10 ft.

option 1 is correct.

step-by-step explanation:

y varies inversely with x and constant of variation is 4

the equation will be:

y = k/x

where k =4 so,

y = 4/x

if we put values of x of option 1 in the above equation and find values of y

y = 4/-2 => y =-2

y = 4/-1 => y = -4

y = 4/1 => y = 4

y = 4/2 => y =2

so, all the values of x and y are correct.

if we put values of x given in other options and find value of y we cannot find whole table satisfying the equation.

hence option 1 is correct.

step-by-step explanation:

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