I need help with 27 and 28 show step and round to nearest tenth

Perform the required operations on the following functions given: f(x)= 3-x; g(x)= -2x find g[f(x)]

The blue lake trail is 11 1/2 miles long. grace has hiked 1 1/2 for 2 hours. how far did she from the end of the trail

Statements reasons 1. ab ≅ cd; ad ≅ bc 1. given 2. ac ≅ ac 2. reflexive property 3. △adc ≅ △cba 3. ? 4. ∠dac ≅ ∠bca; ∠acd ≅ ∠cab 4. cpctc 5. ∠dac and ∠bca are alt. int. ∠s; ∠acd and ∠cab are alt. int. ∠s 5. definition of alternate interior angles 6. ab ∥ cd; ad ∥ bc 6. converse of the alternate interior angles theorem 7. abcd is a parallelogram 7. definition of parallelogram what is the missing reason in step 3?