Brainliest goes to whoever answers correctly try to show work ONLY if you can also if you want more points answer my other questions

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

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0

Aculture started with 4,000 bacteria. after 5 hours, it grew to 5,200 bacteria. predict how many bacteria will be present after 19 hours. round your answer to the nearest whole number.