Marcus estimates that 230 people will attend the choir concert. there was an actual total of 300 people who attended the choir concert. what is the percent error

Select the correct answer. joshua likes to read. he read 6 books when he was 6 years old. every year he doubled the number of books he read the previous year. how many total books did he read between the ages of 6 and 10? a. 60 b. 90 c.186 d.187

Ineed with angles and the measure of them i have abc a is 65 and b is (3x-10) and c is (2x) find the value of x

With alll of except for the 2 that i did already