At the beginning of a snowstorm, Alexandra had 7 inches of snow on her lawn. The snow then began to fall at a constant rate of 2.5 inches per hour. Assuming no snow was melting, how much snow would Alexandra have on her lawn 3 hours after the snow began to fall? How much snow would Alexandra have on her lawn after tt hours of snow falling?
Three hours after the snow began to fall, Alexandra would have 7 + 2.5 * 3 = <<7+2.5*3=15.5>>15.5 inches of snow on her lawn.
After tt hours of snow falling, Alexandra would have 7 + 2.5 * tt inches of snow on her lawn. Answer: \boxed{7 + 2.5tt}.
Snow on lawn after 3 hours:
Snow on lawn after tt hours:
Snow on lawn after 3 hours: 15.5 inches
Snow on lawn after tt hours: 7 + 2.5tt inches