X=7 because 7-3 = 4, 7+8= 15,15x4=60.
It is okay to take the inverse of both side given that you remember to exclude the value that make the denominator zero which is in this case r=-1
I would say the object will float because the density of water is 999.99kg/m which is slightly less than 1g but still more than the object.
This will be an obtuse angled triangle because one angle is greater than 90 degrees.
