Jack says that the solution to 8.5-a=5 is that a equal 13.5 because addition and subtraction are inverse operations and 8.5 +5=13.5. Does jack solution make sense? Explain how do u know wether or not jack solution makes sense without solving

No. Jack's solution doesn't make sense.

Step-by-step explanation:

It is given that, 8.5 - a = 5

Jack is saying that addition and subtraction are the reverse operations. Yes it's true, but here,

8.5 - a = 5

If we move 5 to the opposite side, it becomes -5, and -a to the other side, it becomes a.

So, 8.5 - 5 = 3.5 and not 13.5.

Overall, Jack's solution doesn't make sense.

step-by-step explanation:

the multiplicative inverse of a fraction a/b is b/a. for the multiplicative inverse of a real number, divide 1 by the number. for example, the reciprocal of 5 is one fifth 1/5 or 0.2, and the reciprocal of 0.25 is 1 divided by 0.25, or 4.

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.