1.
julia has taken an online boating safety course and is now completing her end-of-course exam. as she answers
each question, the progress bar at the bottom of the screen shows what portion of the test she has finished.
she has just completed question 16, and the progress bar shows she is 20% complete. how many questions are
on the test.

80 questions

Step-by-step explanation:

100%/20%=5%

5×16=80

Therefore, there are 80 questions in the test.

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.