Ruben bought 6 comic books for $ 21. what was the cost for 1 comic book?

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

In right ∆abc shown below, the midpoint of hypotenuse ac is located at d and segment bd is drawn.if ab = 12 and bc = 16, then explain why bd = 10. hint: consider what you know about the diagonals of a rectangle.

What is the approximate value of  q  in the equation below? –1.613–1.5220.5853.079