Nrite the arithmetic series in summation notation.
3+ 6 + 9 + 12
3+6+ 9 + 12 = E O
n = 1

Given that de, df, and ef are midsegments of △abc, and de=3.2 feet, ef=4 feet, and df=2.4 feet, the perimeter of △abc is .

What is the solution to the equation? k/6.4=8.7 2.3 5.568 15.1 55.68

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x