Use proportion to work out these problems. In each question assume that the rate stays the same.
1 A car uses 20 litres of petrol to travel 160 km.
How much petrol does the car use to travel 400 km?​

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.

Write the slope-intercept form of the line that passes through the point (1, 0) and is parallel to x - y = 7. t

Given a: b and b: c, find a: b: c. write the ratio in simplest form. a: b=6: 10 and b: c=21: 33