Given a set of weights {1,3,9,27}, write a function to construct any number between 1 and 40. in other words, using the set above and the addition and subtraction operations, construct any integer between 1 and 40 without re-using elements.

Fa bus driver leaves her first stop by 7: 00 a.m., her route will take less than 37 minutes. if she leaves after 7: 00 a.m., she estimates that the same route will take no less than 42 minutes. which inequality represents the time it takes to drive the route, r?

Landon wrote that 3−2.6=4. which statement about his answer is true?

Study results indicate that the mean length of time people spend on a bus in a city is between 21.2 min and 24.5 min what is the study margin of the error?