Harry is 4 times as old as sean. In 20 years time he will be twice as old as Sean. How old are they now?​

Can you simplify 4/7? 24 points will be awarded!

Which graph represents the following piecewise defined function?

Which is a true statement comparing the graphs of x^2/6^2-y^2/8^2 = 1 and x^2/8^2-y^2/6^2 the foci of both graphs are the same points. the lengths of both transverse axes are the same. the directrices of = 1 are horizontal while the directrices of = 1 are vertical. the vertices of = 1 are on the y-axis while the vertices of = 1 are on the x-axis.