What are the coordinates of the focus of the parabola?

y=−0.25x2+4
answers
(0, 2.75)
(0, -4)
(0, -3.25)
(0, 3)

How to simply and write the answer n a whole number

What is r i 4.5+10r=-6.5 with work pls

In terms of x, find an expression that represents the area of the shaded region. the outer square has side lengths of (x+5) and the inner square has side lengths of (x-2), as shown. area: a1 x + a2 square units submit