Arrange the following fractions in increasing order. 1/8, 2/10, 11/12, 3/4

What basic trigonometric identity would you use to verify that sin x cos x tan x =1-cos^(2)x?

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?