Write 1.2 x 10^9 as a standard number

You decide instead to take the train there. the train will take 135 minutes. convert this into hours and minutes.

Simply 8x squared + 5(7x squared- x) - 2x =

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers