Look at pic 10 pts will mark brainilest

Find the value of the cosine for angle a

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?

Which of the following could be the ratio of the length of the longer leg 30-60-90 triangle to the length of its hypotenuse? check all that apply. a. 313 6 b. 3: 215 c. 18: 13 d. 1: 13 e. 13: 2 of. 3: 15