Students were surveyed about their favorite colors. 1/4 of the students preferred red, 1/8 of the students prefer blue, and 3/5 of the remaining students preferred green . if 20 students prefer green, how many students were served? and plz show your work.

17. a researcher measures three variables, x, y, and z for each individual in a sample of n = 20. the pearson correlations for this sample are rxy = 0.6, rxz = 0.4, and ryz = 0.7. a. find the partial correlation between x and y, holding z constant. b. find the partial correlation between x and z, holding y constant. (hint: simply switch the labels for the variables y and z to correspond with the labels in the equation.) gravetter, frederick j. statistics for the behavioral sciences (p. 526). cengage learning. kindle edition.

Due to bad planning, two of the local schools have their annual plays on the same weekend. while 457 people attend one, and 372 attend the other, only 104 people were able to attend both. how many people went to at least one play?

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle