The diameter of the earths moon is on average 3.8 x 10 8m. use the formula A=4 3.14r 2 to find the approximate surface area. (use 3.14 for the value)

The function a represents the cost of manufacturing product a, in hundreds of dollars, and the function b represents the cost of manufacturing product b, in hundreds of dollars. a(t) = 5t + 2 b(t) = 7t - 2t +4 find the expression that describes the total cost of manufacturing both products, a(t) + b(t). a. 7t^2 - 7t + 2 b. 7t^2 + 3 +6 c. 7t^2 + 7t - 6 d. 7t^2 - 3t + 6

Simplify the expression. -2/5(10+15m-20n)

There were 25 students who answered to a survey about sports. four-fifths of them like football. how many students like football?