Which of the following sets of numbers could not represent the three sides of a right triangle?
O {15, 20, 25}
O {20, 21, 28}
O {48, 55, 73}
{39, 80, 89}

The half-life of a certain material is 0.002 second. approximately how much of a 14-gram sample will be left after 0.004 second? a. 12 grams b. 3.5 grams c. 0.06 gram d. 7 grams