book Maths Puzzle Numerical Ability

write down the nearest whole number value of x for which xsquared+2x=30

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Simplify the following as much as possible leaved the answer in exact form:
sin 225 degrees ctn 300 degrees + sec 150 degrees cos 315 degrees Question: When Mercury is at its maximum distance from sun it is 43.4 million miles. At its minimum it is 28.6 million miles. What is the difference of its maximum and minimum dist