Four spheres of radius 6cm just fit inside a cylinder calculate the volume inside the cylinder that is empty leave your answers in term of pie

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.

What is the area of the triangle 10 13 12

3x + 4y = 5 x- 3y = -7 solve by substitution