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can someone explain this step by step please

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?

In the diagram below de and ed are tangent to 0 which expression gives the measure of def

Which graph shows the solution to the equation below? log_3(x+2) = 1