Prove that if a ≡ b modulo m and c ≡ d modulo m, then (a + c) ≡ (b + d) modulo m. Conclude that there is a well-defined addition of equivalence classes modulo m given by [a]+[b] = [a+b].

Y=4x^2+x-1 solve using quadratic formula

What can you determine about the solutions of this system

The human resources manager at a company records the length, in hours, of one shift at work, x. he creates the probability distribution below. what is the probability that a worker chosen at random works at least 8 hours? probability distribution px(x) 6 hours 7 hours 8 hours 9 hours 10 hours 0.62 0.78 пол