The height of a ball, in feet, that is thrown straight up and fall straight down is modeled by the quadratic function y = −16(x-1)^2 + 21 where x is time, in seconds. at the time the ball is thrown, how high is it above the ground? the ball is thrown from 1 foot above the ground. the ball is thrown from the ground. the ball is thrown from 21 feet above ground. the ball is thrown from 5 feet above ground.

The physical fitness of an athlete is often measured by how much oxygen the athlete takes in (which is recorded in milliliters per kilogram, ml/kg). the mean maximum oxygen uptake for elite athletes has been found to be 60 with a standard deviation of 7.2. assume that the distribution is approximately normal.

At oaknoll school, 90 out of 270 students on computers. what percent of students at oak knoll school do not own computers? round the nearest tenth of a percent.

9.4.34  question   to estimate the height of a stone  figure, an observer holds a small square up to her eyes and walks backward from the figure. she stops when the bottom of the figure aligns with the bottom edge of the  square, and when the top of the figure aligns with the top edge of the square. her eye level is 1.811.81 m from the ground. she is 3.703.70 m from the figure. what is the height of the figure to the nearest hundredth of a  meter?