10. Define an operation ★ on the set of real numbers as follows:

a ★ b = 0.5ab
If 0.1 ★ b = 10, then evaluate bb.

500

200

20

50

1. ∠1 is complementary to ∠2 and ∠3 is complementary to ∠2. subtraction property of equality 2. m∠1 + m∠2 = 90 and m∠3 + m∠2 = 90 substitution 3. m∠1 + m∠2 = m∠3 + m∠2 definition of complementary 4. m∠1 = m∠3 given