Which of the following sets of numbers could be the side lengths of a triangle?

4, 7, and 13
9, 13, and 23
2, 3, and 4
10, 10, and 30

In the diagram, the ratio of ab to ae is (1/2) . what is the ratio of the length of to the length of ?

To solve the system of equations below, grace isolated the variable y in the first equation and then substituted into the second equation. what was the resulting equation? 3y=12x x^2/4+y^2/9=1

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 =