What is (4,5) moved 90° counter clockwise​

Shane can shovel the driveway in 4 hours, but if his sister it would take 2 hours. how long would it take taylor to shovel the driveway alone

The sum of these consecutive integers is equal to 9 less than 4 times the least of the integer. find the three integers

In a singing competition, there are 150 participants. at the end of each round, 40% of the participants are eliminated. how many participants are left after n rounds?