Which could be the function graphed below? On a coordinate plane, a curve starts in quadrant 2 and crosses the y-axis and goes into quadrant 1. The curve opens down and to the right.

f (x) = StartRoot x minus 5 EndRoot + 1
f (x) = StartRoot x minus 2 EndRoot
f (x) = StartRoot x EndRoot

Which is a true statement about an exterior angle of a triangle a. it is formed by two segments that are not sides of the triangle, b. it forms a linear pair with one of the interior angles of the triangle, c. it is complementary to one of the interior angles of the triangle. d. it is formed by two segments that are sides of the triangle.

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)