Which answer shows 2.13786 times 10 Superscript 4 written in standard form?

Can someone check my answer? you : )

Which of the following equations is of the parabola whose vertex is at (2, 3), axis of symmetry parallel to the y-axis and p = 4? a.)y-3 = 1/16 (x-2)^2 b.)y+3 = -1/16 (x+2)^2 c.)x-2 = 1/16 (y-3)^2

What is the length of the midsegment of a trapezoid with bases of length 15 and 25 ?