Lena owns 5 shares of a certain stock. Yesterday the total value of her shares went down by 20 dollars. What was the change in value for each share? (b)A private club grew by 9 members each week for 18 weeks. What was the total change in the club's size?

Which of these choices show a pair of equivalent expressions?

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

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?