exam Maths Puzzle Numerical Ability

Let J be the jacobian and j the jacobian of the inverse. I need to show that J*j=1. Using tensor notation. Can you help me?

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exam Other Question

find the lateral area of a rectangular solid with length 10 width 6 and height 4 There is a pole in a lake. One half of the pole is in the ground, another one third of it is covered with water, and 10ft is out of water. What is the total length of the pole in ft?