The equation $y = -16t^2 - 18t + 405$ describes the height (in feet) of a ball thrown downward at 18 feet per second from a height of 405 feet from the ground, as a function of time $t$, in seconds. in how many seconds will the ball hit the ground? express your answer as a decimal rounded to the nearest tenth.

After 4.5 seconds the ball reaches ground.

Step-by-step explanation:

We equation of motion given as y = -16t²-18t+405,

We need to find in how many seconds will the ball hit the ground,

That is we need to find time when y = 0

                        0 = -16t²-18t+405

                       16t²+18t-405 = 0

Negative time is not possible, hence after 4.5 seconds the ball reaches ground.

here is your mark brainliest

company a

step-by-step explanation:

using the linear regression models , it is found that company a   pays about $14 more. but using the same regression (linear) company b pays about $10 more.

so company a pays more than b