Marcel conducts an experiment to test which stain remover works best on mustard stains. he wants to make sure that he does not make mistakes and has correct data in his experiment.

what should marcel do to make sure that his data are correct?

conduct a similar experiment with a different washing machine
ask other students to conduct related experiments at their homes
ask his sibling to conduct the same experiment using his washing machine
repeat the experiment several times with the same variable and constants

Following are the  advantages of the parametric equations: 1) they can be used to graph curves that are not functions, like the unit circle.2) the parameter can be used to represent the quantity that is  useful to  provide us with better information about the graph.3)  it is useful to convert between rectangular equations and parametric equations.with specific reference to chemistry,  parametric equations are employ for solving hydrogen and hydrogen-like ions, quantum mechanically. herein, cartesian coordinates are converted in spherical polar coordinates. the solution obtained, when plotted on spherical polar graph paper, provides visualization of atomic orbital such as s,p,d and f. 

D. h2o + h2o > h3o + oh- confirmed.