Find the first three terms of the geometric sequence defined by: a1= 1/2; an=-7a n-1

Asequence of numbers begins with 12 and progresses geometrically. each number is the previous number divided by 2. which value can be used as the common ratio in an explicit formula that represents the sequence? 1/2 2 6 12

Somone me i want to know what 18 hours out of 24 hours in a fraction

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