Why is cosine positive in the 4th quadrant and sine isn’t?

The scale for a map is 20 miles = 1/2 inch. the distance between two towns on the map is 3 3/4 inches. what is the actual distance between these towns? 150 miles 38 miles 75 miles 135 miles

Scrub a dub toothbrushes are $4.00 each. there is a 10% discount, but there is also a 6% sales tax after the discount is applied. what is the new price after tax? round to the nearest penny

Two triangles can be formed with the given information. use the law of sines to solve the triangles. b = 49°, a = 16, b = 14