Write each exponential expression as a decimal 10 to the second tenth of a third 10 to the 5th 10 to the 7th

Hello, i need compare km^2 and km. what's difference in this?

An electrician cuts a 136 foot long piece of cable. one piece is 16 feet less than 3 times the length of the other piece. find the length of each piece

Write the equation of the circle centered at (10,-2) with radius 2