Ratio is the comparison of sizes of two quantities of the same unit. Proportions are the equality of two ratios. A/b =c/d
Simplifying
30c + -45d
Factor out the Greatest Common Factor (GCF), '15'.
15(2c + -3d)
Final result:
15(2c + -3d)
I'm guessing the answer is B? I tried to isolate r and I got that result. Sorry if it's wrong!
Answer:
you have to say the measure