17. If triangle ABD is congruent to triangle CBD, then we know that the angle 4x + 10 = 90. Solving for x, we get 4x = 80.
x = 80/4 = 20.
Now we can solve for the measure of angle C. Given that x = 20, angle C = x + 11 = 20 + 11 = 31.
18. Corresponding sides in congruent triangles are congruent. So, the side labeled with y - 7 is equal to the side labeled 12.
y - 7 = 12
y = 12 + 7 = 19
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