Which expression is equivalent to (3a +b)(2a-4b)

Astudent survey asked: "how tall are you (in inches)? " here's the data: 67, 72, 73, 60, 65, 86, 72, 69, 74 give the five number summary. a. median: 73, mean: 70.89, iqr: 5, min: 60, max: 74 b. 60, 66, 72, 73.5, 86 c. 60, 67, 72, 73, 74 d. 0, 60, 70, 89, 74, 100

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

Evaluate cos2θ for cosθ = square root of 3/2