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(-2,4) is the ordered pairs found in the graph when compared with the following points.
<u>Explanation</u>:
- Ordered pairs are said to be a set of the numbers which are used to plot the point in the graph concerning the X and Y-axis.
- The Ordered pairs are separated by commas and enclosed in a bracket or parentheses. In the ordered pairs the given coordinates represent the two points.
- If (a,b) are the ordered pairs a denotes the X-axis and the Y-axis is denoted by b. Likewise here (-2,4) -2 denotes the point in the X-axis and 4 denotes the point in the Y-axis.
Answer:
Coal.
Explanation:
Steam power plant has the lowest efficiency in electricity production which can only be run with the use of fossil fuels such as coal. The efficiency of this power plant is the lowest because large amount of coal is converted into smoke and other gases and very less amount of coal into heat energy. This coal is used to produce heat energy which can be used in the heating of water to produce steam. This steam is used to move turbines which turn mechanical energy into electric energy.
