The width of a rectangle measures (2.7t+8.7u)(2.7t+8.7u) centimeters, and its length measures (9.7t-2.6u)(9.7t−2.6u) centimeters. Which expression represents the perimeter, in centimeters, of the rectangle?

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes

Can anyone me with 32,33,36,37,and 40.

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days