The value of x is 16 The measure of the missing angle is 48
This is because it’s a right angle meaning the two angles HAVE to equal 90. You can set the equation as 42 + 3x=90 3x= 48 (subtract 48 by 90) X=16 (divide both sides by 3) And then you can plug 16 back into the 3x which would be 3(16) which equals 48 Or You can set the equation as 90-42= 48 And divide by 3 to get x=16
