Which expression is equivalent to 3cos^2(theta/2) -3?
3/2 (COS(theta)-1)
3/2 (cos(theta) –5)
3(cos(theta) + 2)
3(cos(theta) + 1)

Fractions can be added and subtracted only if they're fractions. a. like b. proper c. improper d. unlike

Aperpendicular bisector, cd is drawn through point con ab if the coordinates of point a are (-3, 2) and the coordinates of point b are (7,6), the x-intercept of cd is point lies on cd.

The chs baseball team was on the field and the batter popped the ball up. the equation b(t)=80t-16•16+3.5 represents the height of the ball above the ground in feet as a function of time in seconds. how long will the catcher have to get in position to catch the ball before it hits the ground? round to the nearest second