6a=78 how to solve it

What are the soultion(s) to the quadratic equation 40- x^2=0

Dana kicks a soccer ball. the table shows the height of the soccer ball with respect to the time, in seconds, after the ball was kicked.time | height(seconds) | (feet) ~~~~~~~~~~~~~~~0.5 211 341.5 392 362.5 253 6which graph best displays the relationship shown in the table? (i just need confirmation that its c)

What is the inverse of the function f(x)=19/x³ ?