Nate prepared 21 kilograms of dough after working 7 hours. How many hours did Nate work if he prepared 27 kilograms of dough? Assume the relationship is directly proportional

Which equation represents a direct linear variationa. y=x2b. y=2/5xc. y=1/xd. y=x+3

Me with this assignment ! i only partially understand, so explain. also it's a work sample. at the championship bike race, steve and paula were fighting for first place. steve was 175 feet ahead of paula and had only 300 feet left to go. he was very tired and was going only 9 feet per second. paula was desperate to catch up and was going 15 feet per second. who won the bike race and by how far did she/he win?

Sherrie is baking a pie for her family. she leaves the room and comes back to 35% of the pie having been eaten before she can put the topping on. how much 1 square inch strips of dough will she need for the top, now that a portion is missing? round your answer to the nearest while nimber.