Which of the following represents a pair of proportional ratio or rate?
a. 3 hits in 5 times at bat; 6 hits in 15 times at bat
b. 16 step in 2 minutes; 24 step in 4 minutes
c.$81 for 3 baseball tickets; $54 for 2 baseball tickets
d.183 miles driven in 3 hours; 248 miles in 4 hours

Atype of plant is introduced into an ecosystem and quickly begins to take over. a scientist counts the number of plants after mmonths and develops the equation p(m)= 19.3(1.089)^m to model the situation. most recently, the scientist counted 138 plants.assuming there are no limiting factors to the growth of the plants, about how many months have passed since the plants werefirst introduced? a)o 6.1b)0.6.6c)10 72d)o 23.1