Camila makes and sells jewerly. she has 8,160 silver beads and 2,880 black beads to make necklaces. each necklace will contain 85 silver neads and 30 black beads. how many necklaces can she make?

answer: the area of the parallelogram below is 42 square meters.

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answer: the angel abc is 30°,and the abc is a triangle where the angel bac is 90°

so ac is the half of 24=12ft,and from the pythagorean theorem we find ba

ba=√bc^2-ac^2=√576-144=√432=12√3ft

so bac is 12+12√3=12(1+√3)ft