The graph h = −16t^2 + 25t + 15 models the height and time of a ball that was thrown off of a building where h is the height in feet and t is the time in seconds. at about what time did the ball reach the maximum height?
a) 0.80 seconds
b) 1 second
c) 2 seconds
d) 15 seconds

To find the extreme values of a function f(x.y) on a curve x-x(t), y y(t), treat f as a function of the single variable t and use the chain rule to find where df/dt is zero. in any other single-variable case, the extreme values of f are then found among the values at the critical points (points where df/dt is zero or fails to exist), and endpoints of the parameter domain. find the absolute maximum and minimum values of the following function on the given curves. use the parametric equations x=2cos t, y 2 sin t functions: curves: i) the semicircle x4,y20 i) the quarter circle x2+y-4, x20, y20 b, g(x,y)=xy

Maria walks a round trip of 0.75 mile to school every day.how many miles will she walk in 4.5 days

Betty correctly answers 30 questions on your math test there are 40 questions on the test what percent of the questions did she answered incorrectly