A regular square pyramid has a total surface area of 207 cm² and an apothem length of 4.5 cm. Find the slant height of the pyramid.

Aparallel system functions whenever at least one of its components works. consider a parallel system of n components, and suppose each component works independently with probability 0.5. find the conditional probability that component n works given that the system is working

7x+8y=-18, 4x-9y=-3 solve the system of equations

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