exam Maths Puzzle Numerical Ability

given:
h(x)=x^2-16
f(x)=sqrt x+1

question:
(hof)(x^2)

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exam Other Question

could someone help me solve these equations and write the result in scientific notation..

(3.86x10^15)*(2.15x10^-7)

and

(3.86x10^15)/(4.15x10^-7)

Thanks in advance for your help!
#1simplify:

x-4/x+4 + 2-x/x^2+2x-8

#2simplify:

2x/3x^2-12x + 1/6x

#3 simplify:
(x/x^2-16 - 1/x-4)/ 4/x+4