exam Maths Puzzle Numerical Ability

The US population in 1990 was approximately 250 million, and the average growth rate for the past 30 years gives a doubling time of 66 years. The above formula for the United State

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exam Other Question
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 I need help with this homework problem:
t+22/t square-t-72 + 8/t-9 = 4/t+8

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