Use substitution to solve the system of equations.
x-2y=1
3x-6y=3

How many sides does a regular polygon have if each exterior angle measures 72a.3b.4c.5d.6

Find two rational expressions that have the difference of 2-n/n-4

The weights of players in a basketball league are distributed normally. the distance (d) of each player's weight (w) from the mean of 86 kilograms was computed as follows: d = |w - 86| if d is greater than 7 for approximately 5% of the players, what is the approximate standard deviation of the players' weights? a. 1.75 kilograms b. 3.5 kilograms c. 4.3 kilograms d. 7 kilograms