∠a and ∠b are vertical angles with  m∠a=x and  m∠b=4x−30 . what is m∠a ?

Solve this riddle: i am an odd number. i an less than 100. the some of my digit is 12. i am a multiple of 15. what number am i?

Which function in vertex form is equivalent to f(x) = x2 + 6x + 3? f(x) = (x + 3)2 + 3 f(x) = (x + 3)2 − 6 f(x) = (x + 6)2 + 3 f(x) = (x + 6)2 − 6

Eric drove 275 miles in 5 hours. at the same rate how long would it take him to drive 495 miles?