15 x (7x9)=(15 x 7) x 9 what is the property

Find the value of the cosine for angle a

The following hormone had their receptors in the cell membrane except a-insulin b-tsh c-gh d- cortisol

During the election for class president, 40% of the students voted for kellen, and 60% of the students voted for robbie. 500 students voted in total. how many more students voted for robbie than for kellen? answer with work : )