4. Which of the following additional statements would you need to prove these two triangleS are similar by sas similarly

Which of the following system of equation is not equal to the system of equations is not equal to the system of equations shown below

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

Can someone factor this fully? my friend and i have two different answers and i would like to know if either of them is right. you in advance. a^2 - b^2 + 25 + 10a