Which of the following is the correct si unit to use in measuring the mass of a boulder
a. ounces
b. tons
c. kilograms
d. pounds
(i'm sorry if i didn't pick the right subject )

Two students, each riding bicycles, start from the same apartment building and ride to the same building on campus, but each takes a different route. the first student rides 1100 m due east and then turns due north and travels another 1430 m before arriving at the destination. the second student heads due north for 1930 m and then turns and heads directly toward the destination.at the turning point, how far is the second student from the destination?

Which body part transports oxygen removes waste materials in carries nutrients to the body as part of the circulatory system

Ethanol has a heat of vaporization of 38.56 kj/mol and a normal boiling point of 78.4 c. what is the vapor pressure of ethanol at 14 c?