Pls, Can someone pls answer this scale factor question, It would be greatly appreciated, Thx!!

Iwill give ! if m∠a=59 and m∠3=81°, what is m∠b? m∠b= _[blank]_°

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a. m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

Solve each quadratic equation by factoring and using the zero product property. 10x + 6 = -2x^2 -2