A diver begins rising toward the surface from 180 feet below sea level. A few minutes later, the diver is 40 feet below sea level. How many feet did the diver rise in
those few minutes?

Find the midpoint m of z1=(8+5i) and z2=(12+3i)

Secant be and cf intersect at point d inside a what is the measure of cde

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?