What value of r makes this equation true? justify your solution.
0.4r - 7 = -.3r +2.8

How can you decide witch operations to use to slice a two step equation

What is the gcf of 20c^3-5c^4+30c^6

Three students each examine the system of linear equations shown. 8x + 4y = 16 8x + 2y = 8 caleb says there is exactly one solution. jeremy says there is no solution. kim says there are infinitely many solutions. which student is correct? provide mathematical reasoning to support your answer. answer in complete sentences. : d