Express 0.00419 in standard form with solutions

Which of the following are parts of a sphere

Atriangle has an area of 72 square inches. if the base of the triangle has a length of 18 inches, what is the height of the triangle? use the formula for the area of a triangle: area = (base)(height) type a numerical answer in the space provided. do not include the units or spaces in your answer.

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g