Final answer:
To find the total cost, you need to multiply the weight of each type of bead by its respective price per pound and then add the results together. Lacey purchased 1.8 pounds of heart-shaped beads at $3 per pound, and she also purchased 2.5 pounds of spherical beads at $6 per pound. Therefore, the total cost of the beads is $20.40.
Step-by-step explanation:
To find the total cost, you need to multiply the weight of each type of bead by its respective price per pound and then add the results together.
Lacey purchased 1.8 pounds of heart-shaped beads at $3 per pound, so the cost of the heart-shaped beads is 1.8 * $3 = $5.40.
She also purchased 2.5 pounds of spherical beads at $6 per pound, so the cost of the spherical beads is 2.5 * $6 = $15.00.
Therefore, the total cost of the beads is $5.40 + $15.00 = $20.40.