In Exercises 1923, decide whether the given matrix is invertible, and if so, use the adjoint method to find its inverse.

Lecture 31 Areas (Section 5.1) y = f(x) a b How to ﬁnd the area of the region that lies under the curve y = f(x)fom a to b √ ex. Let f(x)= x and consider the area beneath the graph of the function on [0,4]. y =√x 2 4 Let R ne the sum of the areas of n rectangles with equal width and height