If y varies inversely as the square of x and y= 7/48 when x=4 find y when x=3

Put the equation in slope intercept form by solving for y

Ineed no it anyone can see this

Use the method of cylindrical shells to find the volume v generated by rotating the region bounded by the curves about the given axis.y = 7ex, y = 7e^-x, x = 1; about the y-axis