4. GIVEN: AC II DB, AC = DB Prove: AB = DC (HINT: You first will have to prove that the triangles are congruent)
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Simplify the expression 10/11(22z) + (a+5) -1

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. 4x^2 + 20x + 25 = 0

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.