Isabelle takes a piece of wood that is 7/10 of an inch thick and glues it to a piece of wood that is 2 inches thick. Together, what is the thickness of the two pieces of wood? Write your answer as a fraction or as a whole or mixed number.

The position of a moving particle is given by the position function: f(t)=-9t-t^2-0.2t^3+0.1t^4 a. at what time does the particle reverse direction? b. when is the displacement positive? (round one decimal place and answer in interval notation) c. when is the displacement negative? (round one decimal place and answer in interval notation) d. when is the particle’s acceleration positive? (round one decimal place and answer in interval notation) e. when is the particle’s acceleration negative? (round one decimal place and answer in interval notation)

With finding limits of multi variable !

Sum of the interior angles of a pentagon