A solution is made using 250.0 mL of ethanol (density 0.7892 g/mL) and 171.1 mL of water (density 1.000 g/mL). What is the mass percent of the ethanol?

I'm unsure of how to put it into the calculator? I read that it was ln instead of log. Do i type it all in together and then hit enter?

can you answer the rest

7. Don believes that fewer than one-third of the students at his college hold part-time jobs while in school. To investigate this, he randomly surveyed 116 students and found that 32 students held part-time jobs. a. ( - Provide a 90% confidence interval for the population proportion of students that hold a part-time job. b. 1 (a). ;Give the correct interpretation of the interval in part c. Extra Credit: Does this interval support Don's claim? Why?

All answer options are the same for all 3 parts.

Select the best answer. HO, EtN "R" abbreviation for answers YX b.) d) a.) R.

is the answer in its correct pH significant digit placements?