The density of copper is 9.86 g/cm³.
work out the mass of the solid copper cuboid in kg.

2-digit numbers less than 91 which are 1 less than a multiple of 10

Graph red beads cost $1 an ounce and gold beads cost $3 an ounce. juanita wants to purchase a 12-ounce mixture of red and gold beads that she can sell for $2 an ounce. the solution of the system shows the number of beads needed for juanita to break even. x + y = 12, x + 3y = 24 how many ounces of red beads will juanita buy to break even? how many ounces of gold beads will she buy?

If a is a nonzero real number then the reciprocal of a is