Answer: the best answer is 3(-3a-1)
Step-by-step explanation:
First you add the two parts of the ratio.
2 + 4 = 6
then you divide
30 / 6 = 5
then you multiply into the original ratio
(2 x 5) : (4 x 5)
10 : 20
Answer:
B
Step-by-step explanation:
Picture shows the formula to find the circumference of a circle