Find the 1st term of the sequence whose nth term is 4n + 3

The diameter of a circular chip is doubled to use in a new board game. the area of the new chip will be

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.

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?