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Answers by Erin D.

A vertical line passing through the point (4, -3) means that for any value of y, x is always going to be equal to 4; the formula may be generally written as x = a where a is the x-intercept.. An x-intercept is the value of x when y = 0. As we already stated, for any value of y, x = 4. Therefore,...

If you look at the periodic table, Al's atomic number is 13, so it must have 13 protons(+1) and, resultantly, 13 electrons (-1) to balance out the charge.