Solve for the value of k

k=6

Step-by-step explanation:

a line is 180deg and since there is a 90deg angle there, you can subtract it from 180, leaving you with 90.

(7k + 8) + 40 = 90     >> subtract 40 from both sides

7k + 8 = 50                >> subtract 8 from both sides

7k = 42                       >> divide both sides by 7 to get k alone

k = 6

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step-by-step explanation:

sorry no step by step