Answer:
<em>See explanation</em>
Explanation:
Given
Represent the vertical angle with 

The question has incomplete details because the length of the ladder is not given; neither is the distance between the ladder and the wall given.
<em>See attachment for illustration</em>
So, this solution will be based on assumptions.
Represent
- The height from ground to the top of the ladder with y
- The length of the ladder with L
- The distance between the ladder and the wall with x
Carla could solve for y in any of the following ways:
1. Tan formula

In this case:

Multiply both sides by y


Divide both sides by tan


This can be used if the distance (x) between the ladder and the wall is known.
Assume x = 15


2. Cosine formula

In this case:

Multiply both sides by L




This can be used if the length (L) of the ladder is known.
Assume L = 15


Answer:
4) to reduce greenhouse gases
Explanation/Answer:
Among Russia's most important environmental problems: Water pollution is the most serious concern. Less than half of Russia's population has access to safe drinking water. ... Air quality is almost as poor as water quality, with over 200 cities often exceeding Russian pollution limits, and is likely to worsen.