Find the surface and volume of the sphere. Round answer to the nearest whole number

the surface area is about ___ square inches
the volume is about ___ cubic inches

What is the vertex form of f(x) = x2 + 6x + 3

There were 816 people at a concert when a band started to play. after each song, only half the people stayed to hear the next song. how many people were left at the concert after x songs? write a function to represent this scenario.

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.