Ab and bc are tangent to circle d. find angle b if arc aec measures 210 degrees

In the equation sqrt(n+5)-sqrt(11-10)=1. what is the value of n

Julia bought 7 hats a week later half of all her hats were destroyed in a fire. there are now only 12 hats left with how many did she start

20 points + brainliest answer + my mom’s chocolate chip cookie ! subtract.