Use the first five terms of the exponential series e^x = 1 + x + x^2/2! + x^3/3! + x^4/4! + to approximate e^3.9 to two decimal places.

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.

1. writing an equation for an exponential function by 2. a piece of paper that is 0.6 millimeter thick is folded. write an equation for the thickness t of the paper in millimeters as a function of the number n of folds. the equation is t(n)= 3. enter an equation for the function that includes the points. (-2, 2/5) and (-1,2)

Aquadrilateral has exactly one pair of parallel sides. which name best describes the figure?