Write the decimal in words: 10.12

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

If rt is greater than ba, which statement must be true ?

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