The surface area of a sphere can be approximated as follows:
surface area = 411,
where ris the radius of the sphere;
tt is a constant that is roughly equal to 3.
using the simple approximation above, calculate the surface area of a sphere
with a radius of 2 meters.

Abox contains 1 plain pencil and 4 pens. a second box contains 5 color pencils and 5 crayons. one item from each box is chosen at random. what is the probability that a plain pencil from the first box and a color pencil from the second box are selected? write your answer as a fraction in simplest form.

Dean and karlene get paid to write songs. dean is paid a one-time fee of $20 plus $80 per day. karlene is paid a one-time fee of $25 plus $100 per day. write an expression to represent how much a producer will pay to hire both to work the same number of days on a song.

Jeremy wants to determine the number of solutions for the equation below without actually solving the equation. which method should jeremy use?