If f(x)=3x+5+4/x, what is f(a+2)

In the image, point a marks the center of the circle. which two lengths must form a ratio of 1 : 2? (options are in the images since thought they were harmful phrases)

The diameter of a circular chip is doubled to use in a new board game. the area of the new chip will be

Two streets intersect at a 30- degree angle. at the intersection, the are four crosswalks formed that are the same length. what type of quadrilateral is formed by the crosswalks?