Which term of arithmetic sequence is -18,given that a1=7 and a2=2 with solution

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.

Can someone explain to me how to do

Of the 304 people who attended a school play, 5/8 were students. how many of the people who attended were students.