A person purchased 5k + 2 items for a total cost of 35k2 + 29k + 6. Find the average cost per item of this purchase.

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In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.

Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50.