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can someone please help with my geometry homework?? i haven't been in the class for a year and i'm starting off the second semester completely blind to everything!! please help

can someone please help with my geometry homework i havent been in the class for a year and im starting off the second semester completely blind to everything p class=

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Koalaluvicecream
Ok so for number 5, AB is proportional to BC just like PQ is proportional to QR. AB = 9, BC = 15, PQ = 3, and QR = x. 9/15 = 3/x. Cross Multiply: This gives you - 9x = 45. Divide both sides by 9, and you get x = 5. QR = 5