Find the quotient of these complex numbers (4-6i)/(2-5i)

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

How to find the exponential function y=ca^x, with points (1,2) and (2,1)

Using pert, adam munson was able to determine that the expected project completion time for the construction of a pleasure yacht is 21 months, and the project variance is 4. a) what is the probability that the project will be completed in 17 months? b) what is the probability that the project will be completed in 20 months? c) what is the probability that the project will be completed in 23 months? d) what is the probability that the project will be completed in 25 months? e) what is the due date that yields a 95% chance of completion?