- System of equations by substitution for y=-x+4 and y=3x?

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The average reported is 2.0, and the reported coefficient of variation is 1.0. What is the standard of deviation. Round to 3 decimal place? Discuss how molecular techniques have contributed to our understanding of the cystic fibrosis transmembrane conductance regulators CFTR? Reasons to support plastic surgery? A sphere has volume 2800cm^3 . Find the radius of the sphere.
A.12.81 cm
B.8.75 cm
C.4.375 cm
D.17.5 cm? Could someone please help me with this question?