Find the value of y for the given x equal to a value. y=-2x+7 when x=-2 A. y=3
B. y=-3
C. y=11
D. y=-11

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?

The frequency table shows the results of a survey comparing the number of beach towels sold for full price and at a discount during each of the three summer months. the store owner converts the frequency table to a conditional relative frequency table by row. which value should he use for x? round to the nearest hundredth. 0.89 0.90 0.92 0.96

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