-4k-2=10
-4k=10+2
-4k=12
k=-3
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8x + -2 = 10 8x = 12 x = 1.5
10+r = 2r Subtract r from both sides:- r = 10
x = 20
5n-25 = 10 5n = 10+25 5n = 35 n = 7
All you need to do is substitute the given values of a and c into the equation, then solve for c: a2 + c2 = b2 102 + 302 = b2 100 + 900 = b2 b2 = 1000 b = √1000 b = 10√10