A surveyor measures the distance across a straight river by the following method. Starting directly across from a tree on the opposite bank, she walks d = 76 m along the riverbank to establish a baseline. Then she sights across to the tree. The angle from her baseline to the tree is θ = 28.0°. How wide is the river? m

40.4 m

Explanation:

The width of the river, the distance that she walked and the distance from her final spot to the tree makes a triangle with 1 of the side angle being 28 degrees. If we take the tan of that angle, it would equal to the ratio of the river width w to the distance she walked d = 76m

a high pressure system is a dense air mass that is usually cooler and drier than the surrounding air. a low pressure system is a less dense air mass that is usually wetter and warmer than the surrounding air.

in general, areas that experience high atmospheric pressure also experience fair weather. low pressure systems can cause the formation of clouds and storms. air usually flows from areas of high pressure to areas of low pressure..

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue