Dividing by ZERO….there is one case where you can divide by zero, and that is in electricity. Let’s say you plug in a lamp, your iPhone, or computer into the wall socket; that provides energy in the flow of electrons to your device. Electricity does not flow until a ‘LOAD’ or resistance exists AND...

What I got form your original statement is ‘when do I combine like terms’? For example, you have an expression: 4x + (3x +2) = 9. In this problem you can’t do anything inside the parenthesis so you can drop them, and combine like terms. The new expression would be 7x + 2 = 9…. And the answer would...

Most folks CAN
do large numbers in their head; the problem is we are not taught it. The easiest method is the one Mel S. just explained. Simply learn to round and add....Round 34 to 30 and multiply that by 8, and your brain will eventually learn how to see (30*8 = 240), +
(4*8 = 32) =...