book Maths Puzzle Numerical Ability

Determine the reference angle 0' for the given angle 0=200

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book Other Question

How would you factor x^2 + 10x + 8. It is part of a larger problem I am having alot of trouble with Please solve with work: 3/8=x+1/4

the x+1 is over top of the 4. Like a fraction or maybe it means division. I really need help with this problem. With work because then that way I can use the formula for all the other ones. Thanks so much....