Atrain traveled a distance of 255 kilometers. if the trip took 4 hours, what was the train's average speed in meters per second? give your answer to the nearest whole unit.

The surface area (sa) of a cube with a as the length of each of its sides is given by the formula . if the surface area is known, how can you rewrite the formula to find its side?

According to the 2008 u.s. census, california had a population of approximately 4 × 10^7 people and florida had a population of approximately 2 × 10^7 people. which of the following is true? a. the population of florida was approximately two times the population of california. b. the population of florida was approximately twenty times the population of california. c. the population of california was approximately twenty times the population of florida. d. the population of california was approximately two times the population of florida.

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1