Jennifer can clean her room in 2 hours, while john can clean the same room in 5 hours. how many hours would it take for them to clean the room together?
7
10
seven tenths
ten sevenths
i think the answer is tenth sevenths but im not sure!asap

What is the solution of log2  (3x  -  7)  =  3? 4 5

The means and mean absolute deviations of the individual times of members on two 4x400-meter relay track teams are shown in the table below. means and mean absolute deviations of individual times of members of 4x400-meter relay track teams team a team b mean 59.32 s 59.1 s mean absolute deviation 1.5 s 245 what percent of team b's mean absolute deviation is the difference in the means? 9% 15% 25% 65%

50 plz, given the system of equations, match the following items. x + 3 y = 5 x - 3 y = -1 a) x-determinant b) y-determinant c) system determinant match the following to the pictures below.