Charles won a hamburger eating contest by eating nearly 30 hamburgers in 12 minutes. if he ate a constant rate, determine about how many hamburgers he ate every 2 minutes

For one history test, keith had to answer 40 questions. of these 40 questions, keith answered 28 of them correctly. what percent did keith get on his history test? round your answer to the nearest tenth if necessary

Geometry in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.

In the diagram, gef and hef are congruent. what is the value of x