At what angle(s) is the cosine ratio exactly 1/2? Give a full explanation and draw and example of why

At school there are 526 students and 263 are girls about how likely is it that a randomly chosen student will be a boy

What is the equation of the following graph in vertex form? parabolic function going down from the left through the point zero comma twelve and through the point two comma zero and turning at the point four comma negative four and going up through the point six comma zero and continuing towards infinity courtesy of texas instruments a: y = (x − 4)2 − 4 b: y = (x + 4)2 − 4 c: y = (x + 2)2 + 6 d: y = (x + 2)2 + 12

Can someone me and do the problem plz so i can understand it more better