I need help with #21
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<em><u>The surface area of cylinder in standard form is:</u></em>
<em><u>Solution:</u></em>
Given that,
Radius of cylinder = 2x + 3 inches
Height of cylinder = 3 times radius = 3(2x + 3)
Height of cylinder = 6x + 9 inches
<em><u>The surface area of cylinder is given by formula:</u></em>
Where, "r" is the radius and "h" is the height of cylinder
<em><u>Substituting the given values we get,</u></em>
Thus the surface area of cylinder in standard form is found