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Other Types of Equations

80. Solve the equation $x^{3}+3x^{2}-4x-12=0$.

81. Solve the equation $\displaystyle {\frac {2x+1}{x+4}}+3={\frac {-2}{x+4}}$.

82. Solve the equation $x={\sqrt {2x+3}}$.

83. Solve the equation $4x^{4/5}-54=270$.

84. Solve the equation $6x^{6}+x^{3}-15=0$.

Functions and Graphs

90. Find the distance between points $(3,5)$ and $(-2,17)$.

91. Find the midpoint of the line segment connecting points $(-4,7)$ and $(2,-1)$.

92. Find the intercepts of the graph of the equation $3y=12-4x$.

93. Sketch the graph of the function $y=x^{2}-x-2$ and find its intercepts.

94. Find the center and the radius of the circle $x^{2}+y^{2}+2x-10y=16$ by rewriting the equation in the standard form.