exam Maths Puzzle Numerical Ability

Solve by completing the square

x^2 + 2 = 2x

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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! HI can you help me with this problem?
my triangle on the problem is a right triangle and has an hypotenuseof 16 and an adjacent of 73 degrees what is x equal to on the opposing side adjacent to 73 degrees? Please respond.