TRUE OR FALSE 1. A power is a number that can be written using an exponent. - 2. Trinomials of the form x2 + 2xy + y or x2 - 2xy + y2 are called perfect square trinomials because each is the result after squaring a binomial. 3. A mathematical sentence that contains the symbol >, <, 2, 3, 4, 4, , $,and # is called an equality. 4. Base is a symbol at the upper right-hand corner of a constant, variable or expression. 5. The constant, variable, or expression on which the exponent is used is called exponent.