PLEASE HELP I ONLY HAVE 15 MIN LEFT THANKS IF YOU DO HELP

Find the angle (in radians) between the vectors. (Round your answer to two decimal places.)
u = (3, 9)
v = (9, 0)

= ?

What is the solution of log2  (3x  -  7)  =  3? 4 5

The swimming pool is open when the high temperature is higher than 20∘c. lainey tried to swim on monday and thursday (which was 3 days later). the pool was open on monday, but it was closed on thursday. the high temperature was 30∘c on monday, but decreased at a constant rate in the next 3 days. write an inequality to determine the rate of temperature decrease in degrees celsius per day, d, from monday to thursday.

6x + 3y = -6 2x + y = -2 a. x = 0, y = -2 b. infinite solutions c. x = -1, y = 0 d. no solution