Oil was accidentally spilled into a swimming pool that is 25.0 m wide and 30.0 m long. If 0.50 quarts of oil is in the pool, how thick (in cm) is the oil?

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

How to do this , and can some one explain

In which form is the following function written? y = - 2(x – 3)(x + 5)