If joel loses 20 pounds, he will weigh 50% more than lauren. the sum of their present weight is 300 pounds. what does joel currently weigh

Divide. write in the simplest form. 4 1/6 divided by 10

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

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?