The average human lifespan is 79 years with a standard deviation of 15 years. What is the probability that someone will live between 49 and 64 years?

Geometry in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.

Evaluate the discriminant of each equation. tell how many solutions each equation has and whether the solutions are real or imaginary. x^2 - 4x - 5 = 0

Complete the conditional statement. if a + 2 < b + 3, then a < b b < a a – b < 1 a < b + 1