Growth and decay? please i need help i am not good at this..

Matt had 5 library books. he checked out 1 additional book every week without retuening any books. whats the matching equation

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me

4. (10.03 mc) the equation of line cd is y = −2x − 2. write an equation of a line parallel to line cd in slope-intercept form that contains point (4, 5). (4 points) y = −2x + 13 y = negative 1 over 2 x + 7 y = negative 1 over 2 x + 3 − 2x − 3