A copper-lead alloy is in the ratio of four parts copper to seven parts
lead.
a If a block of this alloy contains 21 kg
of copper, how much lead is there?
Another block of the alloy weighs 2.64 kg.

Will mark determine whether the conjecture is true or false. give a counterexample for any false conjecture. given: points r, s, and t conjecture: r, s, and t are coplanar. a) false; the points do not have to be in a straight line. b) true c) false; the points to not have to form right angles. d) false; one point may not be between the other two.

What is the equation of a line that passes through points (0, 4) and (-4,-8)?

Random variables x poisson~ ( a) ,y poisson ~ ( a) . x and y are independent. if 2 1, 2 1. u =2x+ y-1, v=2x- y +1. find: ) cov (u ,v ).