A convenience store sells a coffee mug that comes with a special price for refills using the mug. The
equation C = 2.3r + 6.5 represents the cost C, in
dollars, of the mug and r refills. What is the cost of
the mug?

Horace's speedometer reads 60 miles per hour, but during a road test he finds that he was actually driving 58 mph. what is the percent error in horaces speedometer?

Write the equation in logarithmic form m^x=n

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?