90 degrees =(x+2) and 90 = (x-6) what does x equal?

How do the number line graphs of the solutions sets of -23 > x and x-23 differ?

3x = 729 solve for x plz . it's urgent. will mark

The life, in years, of a certain type of electrical switch has an exponential distribution with an average life b = 2. if 100 of these switches are installed in dif- ferent systems, what is the probability that at most 30 fail during the first year?