usan asks her neighbor to water a sickly plant while she is on vacation. Without water, the plant has a 0.8 probability of dying. With water, the plant has a 0.15 probability of dying. Suppose she is...

Hello. Can I get help on how to calculate this question? If there is also a way to use the TI-83 graphing calculator, it would be helpful! Thank You!

Extracted text: usan asks her neighbor to water a sickly plant while she is on vacation. Without water, the plant has a 0.8 probability of dying. With water, the plant has a 0.15 probability of dying. Suppose she is 90% certain that her neighbor will remember to water the plant. What is the probability that the plant will be alive when she returns?