exam Maths Puzzle Numerical Ability

simplify each expression
1. 15(x^4y^3)^4 divided by 21(x^5y)^2
2. 8^0
3. 12 divided by (2x)^0
4. 1 divided by 5^-3

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exam Other Question

for each compound inequality, give the solution in both interval and graph form.

3x < x + 12 or x + 1 > 10 IF log x+y/5=1/2(log x + log y), then x/y + y/x= ?