3x - y = 4 and 7x + 2y = 18

Yvaries inversely as x. y =12 when x=5. find y when x=4

Given a normal distribution with µ =50 and σ =4, what is the probability that 5% of the values are less than what x values? between what two x values (symmetrically distributed around the mean) are 95 % of the values? instructions: show all your work as to how you have reached your answer. don’t simply state the results. show graphs where necessary.

Which function is shown on the graph?