Question

I need help on 8,9,10,11 thanks

Answer 1

8) 18 is 9x2,  $\sqrt{18} = \sqrt{9*2} = \sqrt{9} \sqrt{2} = 3 \sqrt{2}$   = 3 * about 1.4 = something above 4 (answer 3) 
9) 3800 miles  / 200 miles a year =  19 years.... 1957+19 years = 1976 (answer 4)
10) individuals + defence = 25% + 42 % = 67%, this means that 100%-67% = 33% left (answer 3)
11) not enough info given. they should give you height of fence - answer 5