The sum of three numbers is 23. The first number is 7 less than twice the second number. The third number is one greater than the sum of the first and second numbers.

6

Step-by-step explanation:

We know the second number has to more than four, otherwise we can't subtract 7. But, if you calculate, 8 would be far too big. A number in between 4-8, 6.

The double of 6 is 12. 12-7=5.

This is showing the first number would be 5 and the second 6.

The third is one more than their sum. 5+6=11+1=12.

So finally adding, 11+12=23.

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.

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step-by-step explanation: