If you think about it, 4x7 is half of 8x7 (If you multiply 4, 7, and 2, you get 8x7). So really you can just multiply 4x7 by 2 and you will get 8x7!
15%
amount error is guess subtract actual amount 198-172 = 26
26/172 = 0.15
0.15 x100 = 15%
Answer:

Step-by-step explanation:
From the question we are told that:
Speed of ball 
Length of field 
Generally the equation for Time taken
is mathematically given by





Therefore it will take the ball to get from one end of the field to the other
Answer:
104.364
Step-by-step explanation:
Product means multiplication so:
44.6×2.34 = 104.364