If m za = 87º and mzb = 32°, find m21.

Step-by-step explanation:

∠1 = ∠A + ∠B          

                 { exterior angle equals the sum of opposite interior angles }

    = 87 + 32

     = 119

24 units

step-by-step explanation:

5=812a+9+3

step 1: simplify both sides of the equation.

5=812a+9+3

5=(812a)+(9+3)(combine like terms)

5=812a+12

5=812a+12

step 2: flip the equation.

812a+12=5

step 3: subtract 12 from both sides.

812a+12−12=5−12

812a=−7

step 4: divide both sides by 812.

812a /812 = -7/812

a= -1/116

so the answer is

a=   -1/116