Solving system using gaussian elimination. x+3y+z=7.50 x+2y+2z=6.85 2x+y+z=6.65

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The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

Write an expression that has three terms and simplifies to 4x - 7. identify the coefficient(s) and constant(s) in your expression

Find the volume of the described solid.the solid lies between planes perpendicular to the x-axis at x = 0 and x=7. the cross sectionsperpendicular to the x-axis between these planes are squares whose bases run from the parabolay=-31x to the parabola y = 30/x.a) 441b) 147c) 864d) 882