Only 25 and 28 are functions.
A function must have only one y value per x value. For 26, the y value of 0 and multiple others have two different y values. For 27, all x values less than 0 have multiple y values.
You are not giving much information so the assumption is the base is 2 = meters and the height is 3 meters.<span>
Find total area of a regular pyramid with base of 2 and altitude of 3
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Surface Area = 16.64911 m²
By figuring out was is X and multiply
<span>All toll free numbers are now working</span>
