Rosie went on a hiking trip. the first day she walked 181818 kilometers. each day since, she walked 90\%90%90, percent of what she walked the day before. what is the total distance rosie has traveled by the end of the 10^\text{th}10 th 10, start superscript, t, h, end superscript day? round your final answer to the nearest kilometer.

117 km

Explanation:

The 1st day, Rosie walked

The 2nd day, she walked 90% of the distance walked the previous day, so

Similarly, on the 3rd day she walked

So the distance walked at the nth day is

This is a geometrical series of the form

where and . The sum of such a series is given by

So for n = 10, we find:

b) phosphorus pentoxide

hello, i am papaguy.

i have found an answer to your question but use it as information.

information: because weak acids/bases have low concentration of hydrogen ions, the addition of water has a large impact on the ph. 2. a difference in 1 unit is a 10x difference in concentration for example; a liquid with ph of 3 is 10x more acidic than a liquid with a ph of 4. therefore, a liquid with a ph of 3 is stronger.

best of luck!