What's 3.8888888888... as a fraction? show work please help

What is the missing reason in step 5? linear pair postulategivendefinition of complementary anglescongruent complements theorem

The average human heart beats 1.15 \cdot 10^51.15⋅10 5 1, point, 15, dot, 10, start superscript, 5, end superscript times per day. there are 3.65 \cdot 10^23.65⋅10 2 3, point, 65, dot, 10, start superscript, 2, end superscript days in one year. how many times does the heart beat in one year? write your answer in scientific notation, and round to one decimal place.

Sasha drank 8 bottles of water everyday for a week. how many bottles of water did she drink in total?