AREA OF SECTORS Someone willing to help me throughout this assignment?

Find all the values of x that make 0.1x + 0.25(102 - x) < 17.10 true.

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

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left