. The height, h, of an object above the ground in feet, can be modeled as a function of time, t, in seconds using the equation:
h(t)=-16(t - 2)^2 + 400
Find the time, in seconds, when the object reaches the ground.

(Please help, I’ll give you brainlist too. I need this ASAP. Also PLEASE add an explanation too, the steps)

Which expression can be used to determine the slope of the line that passes through the points -6, three and one, -9

Type the correct answer in each box. use numerals instead of words. the average number of subscribers to an online magazine each year from 2010 to 2015 is given in the table below. the average number of subscribers to the online magazine in 2010 was the percent increase in the average number of subscribers in 2011 to the average number of subscribers in 2012 was %. the maximum average number of subscribers to the online magazine in the years shown was

Use the irregular polygon below. show all work. a. find the perimeter. b. find the area. the angles of the irregular polygon is 2, 8, 8, and 4.