Not sure about crust, but there will be one crest and 1 trough.
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Since the altitude of the triangle on the sides of the trough are equal, the area covered when the water is h feet deep is 1/2*h². The volume of the trough filled at a given height will be given by V=B*h=h²/2*12=6h². If you differentiate both sides of the above equation with respect to time you get dV/dt=12*h*dh/dt The rate of change of the volume is given to be 2 cubic feet per minute, and we are asked to determine the change of height when h=1 2=12*2*dh/dt dh/dt=1/12 feet/minute
The no. of entities that can be associated with another entity. For eg. 1-1, 1-many, many-1 and many-many
how many 32 are in 1 inch
well if you think about it, its 4 xxx 1/4 + 1/4 = 1/2
1