Answer:
Explanation:
Since the angle we're solving for is a 90-degree angle then we can just add the two given numbers (We know it's a 90-degree angle by the little box).
(3x + 4) + 50 = 90
(3x + 4) + 50 - 50 = 90 -50
3x + 4 = 40
3x + 4 - 4 = 40 -4
3x = 36
3x/3 = 36/3
x = 12
Now that we found x we can plug it into (3x + 4) to find the angle.
3(12) + 4
36 + 4
40
The angle is 40-degrees
You could've also done it an easier way:
Since we know that both givens will be equal to 90 and one given is already a whole number (50)
Then x has to be equal to 12 since that's the only number that can be plugged into 3x + 4 to get 40.