The triangle inequality theorem states that a side of a triangle cannot be greater than the sum of the other two sides.The sums of the pair of sides are shown: 6 + 7 = 13, 7 + 15 = 22, and 6 + 15 = 21. Therefore, the answer to this item is letter "C. no, because 6 + 7 < 15".
The box provides some examples of how<em> exponents can be used to shorten repeated multiplication</em>. The first, third, and fourth boxes all show how the repeated multiplication of 2, 3, and 5 can all be abbreviated as and . The only expression which doesn't belong is , because it's showing how repeated <em>addition</em> can be shortened to <em>multiplication</em>.