Will someone please help me with 13 and 14?

7 children

Step-by-step explanation:

14) Number of children = Cost of the oven ÷ amount paid by each child

                                     = 149.45 ÷ 21.35

                                     = 7

for finding the midpoint of any given 2 pair of points simply add the respective x coordinates with other x coordinate and the y coordinate with other y coordinate and divide them by 2

in your question it will be :

(3+1)/2 for the x coordinate of mid point i.e 2

[8+(-4)]/2 for the y coordinate of midpoint i.e 2

so coordinates of mid point of points (3,8) and (1,-4) will be (2,2)