F(x)=2x for x between 0 and 5. What is the range of f(x)?

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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?

Write an inequality for this sentence the quotient of a number and -5 increased by 4 is at most 8