exam Maths Puzzle Numerical Ability

Find the prime factorization of 300. The answer is in the back of the book but I do not know how to arrive at the answer. Thanks~

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exam Other Question

19 solve for x: -5x/7=-10/21 Graph 3x + 2y = 6

This one is throwing me off because the way I figured this one was 3x-2y = 1 or -1 to get rid of the variable to find the cordinance. Can someone please help me with this one. Thanks