Which underlined gerund functions as the object of a preposition?

Which sentence uses the past tense of to study correctly? a. mark is studying for his math test with margie. b. mark will study for his math test with margie. c. mark studied for his math test with margie.

Afruit stand has to decide what to charge for their produce. they decide to charge \$5.30$5.30dollar sign, 5, point, 30 for 111 apple and 111 orange. they also plan to charge \$14$14dollar sign, 14 for 222 apples and 222 oranges. we put this information into a system of linear equations. can we find a unique price for an apple and an orange?

Would the essay be more effective in explaining the concept of dead reckoning if you knew from the beginning that ahmed is an ant?