A triangle has side lengths of (7a+2b)(7a+2b) centimeters, (6a+3c)(6a+3c) centimeters, and (3c+4b)(3c+4b) centimeters. Which expression represents the perimeter, in centimeters, of the triangle?

Adrawer contains 12 identical white socks, 18 identical black socks and 14 identical brown socks. what is the least number of socks you must choose, without looking, to be certain that you have chosen two socks of the same colour?

If a is a nonzero real number then the reciprocal of a is

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.