Big al's snack stand sells burgers and sandwiches. big al puts two tomato slices on each burger and four tomato slices on each sandwich. if he sells b burgers and s sandwiches, which expression represents the number of tomato slices that he will use?
a.
2s + 4b
b.
2b × 4s
c.
(b + 2) × (s + 4)
d.
2b + 4s

Given: ab ≅ cd and ad ≅ bc prove: abcd is a parallelogram. 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? triangle angle sum theorem sas congruency theorem sss congruency theorem cpctc