For two adjacent angles with measures x° and (x+30)° that make up a 90° angle, what is x ?(

In a 90° angle, the sum of the measures of the two adjacent angles is 90°. Therefore, x + (x + 30) = 90°.

Combining like terms, 2x + 30 = 90.
Subtracting 30 from both sides, 2x = 60.
Dividing both sides by 2, x = 30.
So, x = 30°.