I need help brainliest?

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

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

What adds to be the bottom number but also multiplies to be the top number with 8 on the bottom and 15 on top