A cat initially weighs 850 grams. It loses 4 percent of its weight every 7 years. Find its weight after 6 years.

The half life of a cell is 180 years. The initial mass is 40 units. Find the mass after 300 years.

Line w passes through (6,12) and (-4,-8). Find the x int and y int. Line q is perpendicular to line w. Line q passes through (14,2). Find the x int and y int of line q. If line q passes through (2,d), what is the value of d?

Correlation versus causation: Suppose that you see a data set that shows a positive linear relationship between students’ GPAs and their SAT scores. Can you conclude that earning a higher GPA leads to a higher SAT score? Absolutely not. You can only conclude a positive correlation between GPA and SAT score. It could be the[…]

The residual: In statistics, we learn that the residual is the leftover-the unexplained. The concept of a residual or leftover unexplained portion of a puzzle emerges in standardized reading passages. Consider a passage in which the author describes an audience who sees scientific evidence for a cancer treatment but does not express support for the[…]

The transitive property: I often tell my students that half of the SAT is understanding the transitive property. If an apple is an orange and an apple is a grape. What do you know? You know that an orange is a grape. Similarly, if an apple is an orange and an orange is a grape,[…]