This is my math hw and i dont know how to do this d: look at the screenshot and its 18-20

The angle m 2 is going to be the same as angle 4. but for 1 and 3 has to make up for 180 degrees because the angle is straight. So you would need to figure out what numbers equal 180 degrees

1. isolate the variable, in this case, d. subtract 35.5 on both sides of the equation.2. 52 subtracted by 35.5 is 16.53. therefore your answer would be d= 16.5this is the basics of pre algebra, isolating variable through adding, subtracting, multiplying, and dividing, if you have any other questions to ask just comment!