Which of the following statements is not always true?

a.
in a rhombus, both pairs of opposite sides are parallel.
b.
in a rhombus, the diagonals bisect each other.
c.
in a rhombus, all four angles are congruent.
d.
in a rhombus, both pairs of opposite sides are congruent

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

Which of the following is an equation of a line parallel to the equation y=4x+1?

Suppose you want to transform the graph of the function y=tan(x+pi/4)-1 into the graph of the function y=-tan(x+pi/2)+1 which transformations should you perform. a) reflect the graph of the first function across the x-axis, translate it pi/4 units to the left, and translate it 2 units up. b) reflect the graph of the first function across the x-axis, translate it pi/4 units to the right, and translate it 2 units up. c) reflect the graph of the first function across the line y = -1, translate it pi/4 units to the left, and translate it 2 units up. d) reflect the graph of the first function across the line y = -1, translate it pi/4 units to the right, and translate it 2 units up.