Prove hat if the opposite angles of a parallelogram are supplementary, than the parallelogram is a rectangle.

Hurry if the population of of an ant hill doubles every 10 days and there are currently 100 ants living in the ant hill what will the ant population be in 20 days

Renee hiked for 6 3 /4 miles. after resting, renee hiked back along the same route for 5 1 /4 miles. how many more miles does renee need to hike to return to the place where she started? represent your answer as a simplified mixed number, if necessary.

Can someone answer and tell me how to do this (will mark brainliest)