4times the square of one number minus 5 times another number

The only way to identify an intercept is as an ordered pair. true false

Plz hurry evaluate the expression a+b where a=8 and b=19

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