Match the volume of the cube to the length of each edge.

7

Step-by-step explanation:

If volume is equal to length to width to height, then 343 = l x w x h. Since the shape is a cube, all the sides are equal so length width and height are equal. Thus, they can all be represented by x. So 343 = x to the third power. You can then take 343 to the third root and get 7. Also, if I counted correctly, each individual unit cube on the length width and height are seven. So length is 7 width is 7 height is 7 and 343 to the third root is 7.

add all the numbers and check the ones place.

the answer is 486. as the ones place is more than 4, the estimation will be the next 10 ie, 490

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.