If he mean of 3,4,6,9,a 10 is 7 find the value of a
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10

Step-by-step explanation:

7*6=3+4+6+9+a+10

42=32+a

42-32=a

a=10

Step-by-step explanation:

Mean =7

⇒(3+4+6+9+a+10)/6=7

⇒32+x=42

⇒x=10

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.