Find any points of discontinuity for the rational function. what are the points of discontinuity? are they all removable?
y = (x-7)(x-3) / x^2-10x+21
a. x = 1, x = –8, x = –2; yes
b. x = 7, x = 3; yes
c. x = –7, x = –3; no
d. x = –1, x = 8, x = 2; no

Aball is thrown from a height of 139 feet with an initial downward velocity of 15 ft/s. the ball's height h (in feet) after t seconds is given by the following. h=139-15t-16t^2 how long after the ball is thrown does it hit the ground? round your answer(s) to the nearest hundredth. (if there is more than one answer, use the "or" button.) t =

The radius of a sphere is 3 inches. which represents the volume of the sphere?

Ellen makes and sells bookmarks. she graphs the number of bookmarks sold compared to the total money earned. why is the rate of change for the function graphed to the left?