A. 14 (7x2=14)
b. 8 (8x3=24)
c. 11 (no other numbers except 1 and 11 multiply to get 11)
They go up by 12
17-5=12
22-10=12
27-15=12
32-20=12
X=2 because 3 times 2 is 6 and then you add 6 and 7 together and get 13.
given h = 600 - 16t ( add 16t to both sides )
16t + h = 600 ( subtract h from both sides )
16t = 600 - h ( divide both sides by 16 )
t = 
when h = 400
t =
=
= 12.5 seconds