Given the relation y = 3x + 1, if the input is 4, what is the output? HINT: output is the dependent variable or range.

A. 8
B. 13
C. 4
D. 49 is not the right answer

Sound travels about 750 miles per hour. a) suppose it takes about 1.5 seconds to hear the echo. how far away is the canyon wall, in feet? for this i got 825 ft b) suppose you stand 1,925 feet from the canyon wall and sound the horn. how long will it take to hear the echo? (i'm stuck on this)