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Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

Taylor wants to paint his rectangular deck that is 41 feet long and 24 feet wide. a gallon of paint covers about 350 square feet. how many gallons of paint will taylor need to cover the entire deck? round your answers to two decimal places when necessary.

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)