On serena's tenth birthday ,her mom was 3 times serena's age how old will serena and her mom be when her moms age times 0.5 will equal serena's age

How is the number of vertices for a prism related to the name of the prism

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Abird on top of a 200 ft bridge tower sees a man standing on the lower part of the bridge (which is 50 ft above the ground). the angle of depression from the bird is 26 ̊. how far is the man from the base of the bridge tower? with explanation and pictures .