- System of equations for 2x+4y=16 and x+4y=-4?

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What s the equation for finding the minimum height and angle required for fitting a 40mm x 21mm plane inside a 34.3mm inner diameter tube? If a 6.0 x 10-3 M solution of the antibiotic is stored at 20o
C, what will its concentration be after 3
months? What is the name of this excercise machine?
Or A Video would be helpful on how to use it..
Photo link https://ibb.co/eifrvG? How the conductivity of electricity and the high melting boiling point of metal are expalined by metallic bonding? How much cost DNA test in the phil.?