exam Maths Puzzle Numerical Ability

the det of x+2 2x+3 3x+4
2x+3 3x+4 4x+5
3x+5 5x+8 10x+17
is zero. solve for x

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exam Other Question

How do I do these problems with variables and exponents?

z to the 4th power /x squared

z to the 4th power / z to the 5th power saturn is about 1.429 X 10^9 km from the sun. how many miles is saturn from the sun? write your answer in scientific notation.