Twice the difference of a number and 5 is 7​

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

An arithmetic series a consists of consecutive integers that are multiples of 4 what is the sum of the first 9 terms of this sequence if the first term is 0

The radius of the circle below intersects the unit circle at (3/5,4/5). what is the approximate value of theta? 0.6 radians 1.0 radians 36.9 degrees 53.1 degrees