Jared ran 0.34 of a mile, andrew ran 0.46 of a mile, and nick ran 1.23 miles. how many miles did the three boys run together? which equations lead to the correct solution?

Natasha spent 1 1/2 hours on the beach. she fell asleep for 3/4 of the time she was on the beach and then woke up with a terrible sunburn. how many hours was natasha asleep on the beach?

Colby and jaquan are growing bacteria in an experiment in a laboratory. colby starts with 50 bacteria in his culture and the number of bacteria doubles every 2 hours. jaquan starts with 80 of a different type of bacteria that doubles every 3 hours. let x equal number of days. colbys experiment follows the model: a.) y=50*2^x b.) y=50*2^8x c.) y=50*2^12x jaquans experiment follows the model: a.)80*2^x b.)80*2^8x c.)80*2^12x

Using only the digits 5, 6, 7, 8, how many different three digit numbers can be formed if no digit is repeated in a number?