Plz hurry it's urgent! in constructing a box-and-whisker plot from a data set, which value is not necessarily indicated on the plot? a. the mean b. the median c. the first quartile d. the third quartile

The path traveled by a bottlenose dolphin as it jumps out of water is modeled by the equation y=-0.4+3x, where t is the height above water and x is the horizontal distance in feet. if a beam of light is shone upward at an angle modeled by the equation x+y=10, at what height from the waters surface will the beam of light hit the dolphin