Ashton university creates a 10-digits student number as the university enrolls each student. the first two characters must be a digit from 1 to 9. the next seven characters can be anything and the last digit just can not be the same as the ninth character. how many student numbers are possible

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.