Answer: I think the answer is #1
The area of the triangle is 14.1 square meters
<h3>How to determine the triangle area?</h3>
The side lengths are given as:
5m, 6m and 9m
Calculate the semi-perimeter (s) using
s = (5 + 6 + 9)/2
Evaluate
s = 10
The area is then calculated as:

This gives

Evaluate the products

Evaluate the exponent
Area = 14.1
Hence, the area of the triangle is 14.1 square meters
Read more about areas at:
brainly.com/question/27683633
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Decrease in the temperature: 5.4×5=27°C
Final temperature: 12-27=-15°C
Slope intercept form is y=mx+b. In this case, I believe it's y= -5/6x -5/6.