I don’t know how to answer this question!

7x+8y=-18, 4x-9y=-3 solve the system of equations

The volume of a sphere is increased by 6%. calculate the corresponding percentage increased in it area.

1. writing an equation for an exponential function by 2. a piece of paper that is 0.6 millimeter thick is folded. write an equation for the thickness t of the paper in millimeters as a function of the number n of folds. the equation is t(n)= 3. enter an equation for the function that includes the points. (-2, 2/5) and (-1,2)