Problem: Mark has a doctors appointment today for a routine checkup. When he gets his blood pressure taken the doctor looks a bit worried. He tells Mark that his blood pressure is 141/92 at resting. Given Mark starts dieting and exercises more, will his chances of having a stroke increase or decrease?

A: decrease

Problem: John is learning about different states of matter. So far, he recognized three states of matter, state A, state B, and state C. State A is in solid state. State B is in liquid state, and state C is in gaseous state. He needs to learn more about their individual characteristics. Would state B have higher or lower pressure than state C?

A: higher

Problem: David was studying human history. He selected two specific eras of human history, era A and era B. Era A was before humans had invented agriculture. And, era B was after the invention of agriculture. He noticed that human societies had changed dramatically after the invention of agriculture. Which era saw higher death rate, era A or era B?

A: era B

Problem: David works as a nutritionist with the public health department. He categorized the certain sections of his county's population. First he categorized boys and girls between nine and thirteen years as cat A. Then he put girls between fourteen and eighteen years in cat B, and boys of the same age in cat C. Lastly, he categorized pregnant women as cat D. He needs to recommend healthy diet, especially iron intake, for each group. Which group would need less iron, cat C or cat D?

A:
cat C