Agnes has 23 collectible stones, all of which are labradorite crystals or galena crystals.
Labradorite crystals are worth $20 each, while
galena crystals are worth $13 each. Agnes
earns $439 by selling her entire collection. How
many stones of each type did she sell?

The answer is she sold 20 labradorite crytals and 3 galena crystals.

Step-by-step explanation:

First you times 20 x 20 and get 400 and then times 13 x 3 and get 39 and 400 plus 39 equals $439.

the expression (1.26)2t reveals the approximate rate of increases in the number of plants semiannually.

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