1. In an AP 9th term is equals the sum of first 4 terms. Find a) the relation between the first term a and the common difference d.​
b) the sixth term when X=1/4
c) the sum to infinity

If a flying disk is 139 meters in the air and travels at an average of 13 m/s how long is it in the air

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

Harold moves no more than 43 of his sheep and goats into another field fewer then 22 of his animals are goats