Triangle abc has vertices a(1,4), b(−2,4) , and c(−1,−1) . a dilation with a scale factor of 0.25 and center at the origin is applied to the triangle. what are the coordinates of b' in the dilated image? enter your answer in the boxes. b' has a coordinate pair of ( , )

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)