Cosine is the square root of 3 over 2. how do i find the secant expression without a square root in the denominator by rationalizing the denominator?

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Write the fraction or mixed number and the decimal shown by the model

Suppose that sahil knows that 45 people with ages of 18 to 29 voted. without using a calculator, he quickly says then 135 people with ages of 30to 49 voted. is he correct? how might sohil have come up with his answer so quickly?