When an object is thrown from the ground into the air with an initial upward speed of v, meters
per second, the speed v, in meters per second,
is given by the equation v=vo-9.8t , where t
is the time in seconds. The speed of an object
becomes 0 when the object reaches its maximum
height. If an object is thrown upward with an initial
speed of 14 m/sec , how many seconds does it
taken an to reach its maximum height?
(Round your answer to the nearest hundredth of
a second.)

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