(25 points) Mark any solutions to the equation 2cos^2x - 1 = 0

-7pi/4
15pi/4
3pi/4
pi/8

Arianna is buying plants for her garden. she buys 15 flowering plants for $96. pink flowering plants sell for $8, and purple flowering plants sell for $5. how many pink flowering plants did arianna buy? i figured out the answer! the answer is 7. 8x +5y = 96 plug in 7 for x 8 (7) + 5y = 96 56 + 5y = 96 subtract 56 from both sides 5y/y = 40/5 y = 8 she bought 7 pink and 8 purple plants

F(x)= 4x g(x) =x-1 what is f(x) divided by g(x)

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