What does the sign in the picture above mean?

Determine the volume of a cylinder bucket if the diameter is 8.5 in. and the height is 11.5 in.

Which of the statements about the graph of the function y = 2x are true? check all of the boxes that apply. the domain is all real numbers x because the exponent of 2 can be any real number when the x-values increases by 1 unit, the y-value multiplies by 2. the y-intercept is (0, 1). the graph never goes below the x-axis because powers of 2 are never negative. the range is all real numbers.

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!