Alexandra has 78 emails in her box. she deletes 47 emails. how many emails are left in her box? draw jumps and label the number line to show your thinking.

i know the answer is 78-47=31 ( but i am having trouble with the jump labeling i know you can draw the line for the bar but can you just write the numbers in a row and i can line jump from there asap )

< > this is the jump and label to get the answer

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