Help please! Will give for the correct answer! Which of the following designs is MOST vulnerable to history effects?

Switching replication with
treatment removal

One-group pretest-posttest

One-group posttest only

Which best explains why this triangle is or is not a right triangle?

Kyle and elijah are planning a road trip to california. their car travels 3/4 of a mile per min if they did not stop driving, how many miles could kyle and elijah drive in a whole day? ? 1 day = 24 hours. plzzz i will give you 100 points

Can someone me with these two circle theorem questions asap?