In a certain classroom, the ratio of boys to girls is 2 to 1. if there are 39 students in the classroom, how many are boys?

26

Step-by-step explanation:

Divide the total by the number it's split into. 2+1=3, so 39÷3=13. Since the ratio is 2 to 1, the 13 represents the 1. 13×2=26, so the actual amount each is 26:13. Which means that there are 26 boys.

18

step-by-step explanation:

draw the shape and you will see that f and k are actually at adjacent vertices (points of the hexagon that are neighboring).   so find the distance between (1,2) and (4,2).   that is easy since (1,2) and (4,2) is just a vertical distance to count, which is 3.   it is a regular polygon which means all sides are congruent.   you have 6 sides (hexa) so multiply 6 by 3 to receive 18.