Magoosh Problems

1) approach is to make sure they are divisible by both 4 & 9 (since 36 is 4 * 9) 2)Rule for 4: If last 2 digits divisible by 4, then entire number divisible by 4 3) Rule for 9: If number that all digits add up to is divisible by 9, then its divisible by 9

Determine which numbers in list are divisible by 36?

1) To find this take sqrt of 2.4 * 10 ^ 7 We need to think of 2.4 as 25 /10 2) After this change we rewrite as 25 * 10^6 3) Srqt of 25 * 10^6 = 5 * 10^3 Sqrt of m^n = m ^ n/2

The speed of light is 2.4 * 10 ^7 light years ^2. How long would a single side of this region be?

1) First want to form common fraction out of second part of question: x^2 + y^2 / xy 2) Can substitute left part of question into this formula, we get this leads to 12 / 5 Answer: 2 & 2/5

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