7.5. 15. 30. None of the choices are correct.

15

Step-by-step explanation:

Since we are given 2 sets of angles, we can determine the 2 triangles as congruent using AA Congruence Theorem. So if mAB = 15, then mCB also equals 15.

Step-by-step explanation:

∠ABC forms and  Obtuse angle ( A measure greater than 90° but less than 180°)

mAB is 90° and mCB is 30°

If AB = 15, then CB must be 12.

1/5x+9 2/5y+7

step-by-step explanation:

days of the week

step-by-step explanation:

javier earned more money then kyle, so that won't always be a constant term, but the days of the week do not change so that term is always constant.

edit: i meant