Is a triangle with the given side lengths of 15cm, 17cm, and 19cm a right triangle?

Many newspapers carry a certain puzzle in which the reader must unscramble letters to form words. how many ways can the letters of emdangl be arranged? identify the correct unscrambling, then determine the probability of getting that result by randomly selecting one arrangement of the given letters.

Given the expression (7 ? 4i) ? (2 + 6i), perform the indicated operation and write the answer in the form a + bi.

In the figure, triangle aob and triangle boc form a linear pair ,find the measure of x