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solve the following proportion.

r/5 = 9/21

a. r = 2.14

b.4 = 9

c. r = 11.66

d. r = 37.8

The interior angles formed by the side of a hexagon have measures of them up to 720° what is the measure of angle a

Write the equations in logarithmic form 10^3=1,000

Percy rides his bike 11.2 miles in 1.4 hours at a constant rate. write an equation to represent the proportional relationship between the number of hours percy rides, x, and the distance in miles, y, that he travels.