Since we are looking for the time it takes for the stone to hit the ground, then it means that we set the height y to 0 ft.
y = -16t² + 486
0 = -16t² + 486
16t² = 486
t² = 30.375
t = 5.51 seconds
<u>The surface area of the cylinder= 2 π * r^2</u>
<u>Step-by-step explanation</u>:
The surface area of each end and the surface area of the side of the cylinder are added to get surface area of a cylinder.
We know that each end of the cylinder is a circle.
So the surface area of each end of the cylinder is π * r^2
Here, r is the radius of the end
There are two ends, so their combined surface area= 2 π * r^2
<em><u>The surface area of the cylinder= 2 π * r^2</u></em>
The number is negative 23
All of the telephones * all of the telephones minus one (because one is in use)
85 * 84 = 7140 connections
The measure of it would be 135 degrees