Explain how to find the area of the irregular figure shown.
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Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

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

Which shows the first equation written in slope-intercept form? 1/2 (2y + 10) = 7x