A cyclist sprinter does 1200 J of work in a race. While her bike does 800 J of work during the race. What is the efficiency of the bike?

How many degrees does the hour hand move from 3: 00 to 5: 30?

Aswimming pool had 2.5 million liters of water in it. some water evaporated, and then the pool only had 22 million liters of water in it. what percent of the water evaporated?

What is the product? a-3/15a × 5/a-3