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Add '-1' to each side of the equation.
1 + -1 + 3d = 10 + -1
Combine like terms: 1 + -1 = 0
0 + 3d = 10 + -1
3d = 10 + -1
Combine like terms: 10 + -1 = 9
3d = 9
Divide each side by '3'.
d = 3
Simplifying
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Irregular hexagons (Meaning 6 sides, irregular is optional) and quadrilaterals.
I’m pretty sure the answer is D. Sorry if I’m wrong
<em>See</em><em> </em><em>above</em><em> </em><em>graph</em>
I am joyous to assist you anytime.