Which of following expressions is a polynomial? f(x)=1/5x^2+4.5x+2, f(x)=-3x^4+8x^2-2sqrtx+1, f(x)=-2.1x^7+3x^2+17/2x, f(x)=4/x-11x^2

Explain why the two figures below are not similar. use complete sentences and provide evidence to support your explanation. (10 points) figure abcdef is shown. a is at negative 4, negative 2. b is at negative 3, 0. c is at negative 4, 2. d is at negative 1, 2. e

Ineed with this problem 21 show steps

How are sas and sss used to show that two triangles are congruent?