4x + 5 = 25 what is x?

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

Atriangular field has sides of lengths 21, 39, and 41 yd. find the largest angle. (round your answer to the nearest degree.)

Use the method of cylindrical shells to find the volume v generated by rotating the region bounded by the curves about the given axis.y = 7ex, y = 7e^-x, x = 1; about the y-axis