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find the exact value of -345º

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Lena reflected this figure across the x-axis. she writes the vertices of the image as a'(−2, 8), b'(−5, 6), c'(−8, 8), d'(−4, 2).

Could somebody me with this radical simplification?