Which expression is equivalent to 3(x + 2) + 5(x - 3)

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

The base of a triangle exceeds the height by 9 inches. if the area is 180 square inches, find the length of the base and the height of the triangle.

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?