An object is launched straight up into the air with an initial velocity of 40 meters per second, from a height 30 m above the ground. How many seconds later will the object hit the ground?

Enter your answer as a number rounded to the nearest tenth, such as: 42.5

Which of the statements about the graph of the function y = 2x are true? check all of the boxes that apply. the domain is all real numbers x because the exponent of 2 can be any real number when the x-values increases by 1 unit, the y-value multiplies by 2. the y-intercept is (0, 1). the graph never goes below the x-axis because powers of 2 are never negative. the range is all real numbers.

Can someone me out here number 4 plz

If y varies directly as x2 and y=6 when x=6, find the constant of variation.