Solve all please thank you very much;)

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

Given the graphed function below which of the following orders pairs are found on the inverse function

Apiling for a high-rise building is pushed by two bulldozers at exactly the same time. one bulldozer exerts a force of 1250 pounds in a westerly direction. the other bulldozer pushes the piling with a force of 2650 pounds in a northerly direction. what is the direction of the resulting force upon the piling, to the nearest degree? a. 65 n of w b. 25 n of w c. 45 n of w d. 35 n of w