The first term of A. P is 5 and the last term is 45 and the sum of all term is 400. find the number of terms and the Common difference help plz​

What is the geometric mean of 3 and 7? a) square root of 21 b) 2 square root of 6 c) 2 square root of 7 d) 21

Arectangle has a length of 6cm by 8cm what is the length of a diagonal of the rectangle

Jack has a rectangular piece of land, the area of which is represented by a1 = 9.5l. his brother has a different rectangular piece of land, the area of which is represented by a2 = l(14 − l). let a represent the area in square meters and l represent the length in meters of the pieces of land. the two equations plotted on a graph meet at a point as shown in the image