The first term of a arithmetic sequence is 2 and the 4th term is 11, how do i find the sum of the first 50 terms

The length of each stair is 11 inches. what is the rise, r, for each stair? round to the nearest inch. 2 inches 7 inches 17 inches 24 inches

Alonso walked with his friend andy one day, and wanted to compare their speeds. alonso walked 3 miles in one hour, and andy walked 2 miles in 2 hours. complete the table to graph the relationship for each person.

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.