Which of the following statements is a tautology and why is it that right answer a. integers are rational numbers. b. whole numbers are natural numbers. c. rational numbers are irrational. d. irrational numbers are integers.

Given: circle o, cd is diameter, chord ab || cd. arc ab = 74°, find arc ca.

Luke started a weight-loss program. the first week, he lost x pounds. the second week, he lost pounds less than times the pounds he lost the first week. the third week, he lost 1 pound more than of the pounds he lost the first week. liam started a weight-loss program when luke did. the first week, he lost 1 pound less than times the pounds luke lost the first week. the second week, he lost 4 pounds less than times the pounds luke lost the first week. the third week, he lost pound more than times the pounds luke lost the first week.

The given diagram shows the parts of a right triangle with an altitude to the hypotenuse. using the two given  measures, find the other four.