A=18 B=3 bc +4 Substitute the value with a number evaluate each algebraic expression using the given values. What is the number?

See attachment below and find the equivalent of tan(∠qsr)

If t17 = 3 (t5) in an arithmetic progression, find t1 in terms of d.

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?