Solve the linear system by gauss-jordan elimination

How are sas and sss used to show that two triangles are congruent?

If sin(x) = 0 and cos(x) = 1, what is tan(x)?

Sketch the region enclosed by the given curves. decide whether to integrate with respect to x or y. draw a typical approximating rectangle and label its height and width. y= 5x, y=7x^2then find the area s of the region.