identify the domain of the exponential function shown in the following graph:
a. all real numbers
b. x ≥ 0
c. 0 ≤ x ≤ 30,000
d. 7 ≤ x ≤ 30,000

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