This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.
ScanSolve AI Answer
Hello Wumbei! Let's find the value of y. Step 1: Identify the type of angles. The angles 21^, 57^, 42^, and 3y are angles around a central point. The sum of angles around a point is 360^. Step 2: Set up the equation. Add all the given angles and equate them to 360^: 21^ + 57^ + 42^ + 3y = 360^ Step 3: Sum the known angles. 120^ + 3y = 360^ Step 4: Solve for y. Subtract 120^ from both sides of the equation: 3y = 360^ - 120^ 3y = 240^ Divide by 3: y = (240^)/(3) y = 80^ The value of y is 80. y = 80 That's 2 down. 3 left today — send the next one.