Which expression does the graphic represent? 8 positive tiles. 1 tile is crossed out.

7 minus 1

7 minus (negative 1)

8 minus 1

8 minus (negative 1)

What is the rotational symmetry of a wheel

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 =

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m