## Algebra 1

Second, find the turning point the x corrdinate of the turning point is the midpoint of the x-intercept therefore $(0+7.17)\div2=3.56$ x=3.56 sub x=3.56 into the equation $y=(-0.628)\times3.56x^{2}+4.5\times3.56$ y=8.06 therefore the turning point is (3.56, 8.06) So, when the water level rises by 5.5 feet $5.5\lt8.06$ therefore, the top of the arch support is above the water