Ineed to check the quadratic equation 3z=-z^2 i got z=0 and z=-3 just need to know how to check it. thanx

Element x decays radioactively with a half life of 8 minutes. if there are 450 grams of element x, how long, to the nearest tenth of a minute, would it take the element to decay to 37 grams?

The class wants to raise a total of $750.if they receive a profit of $1.25 from each candybar sold, how many bars must they sell to reachtheir goal

Find the slope and the y-intercept if there's one and the equation of the line given these two points( 3, 2) and( 3, -4)