The sum of the first four terms in an arithmetic progression is -18 and the sum of the first six terms is -9. Find the sum of the first ten terms.​

Find the pattern and use it to list the nth term in the sequence. 6, 12, 20, 30, 42, 56, the nth term of the sequence is

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2

Since opening night, attendance at play a has increased steadily, while attendance at play b first rose and then fell. equations modeling the daily attendance y at each play are shown below, where x is the number of days since opening night. on what day(s) was the attendance the same at both plays? what was the attendance? play a: y = 8x + 191 play b: y = -x^2 + 26x + 126