Answer:
12
Step-by-step explanation:
An isosceles triangle are three sides of two sides being equal in lengths.
If that is the case, the two opposite slanting sides which are equal, must be longer. Invariably, the third side is 12.
Hello here is a solution :
4h +8=20
Hours worked times rate paid plus 8 must equal 20
A = 3b Divide both sides by 3

= b Switch the sides so it's easier to read
b =