Does anyone know this answer? it's like that answer to a problem, Example: 12 + the sum of 9+19=?

12a X 9b=?

a=9

b=6

Strengthening a response by providing something needed to survive is called negative reinforcement primary reinforcement secondary reinforcement punishment

Which two groups of organisms were commonly found during the Jurassic Period?

when is a federal state a more efficient organization method for a state? explain why using one specific example.

Which factor will likely have the greatest influence on Japan's demographic changes between now and 2050? a.) technological changes b.) food production c.) natural resources d.) healthcare needs e.) social customs

Your science class is building a circuit by connecting a light bulb and a battery. The class connects these items with copper wire. Is the choice to use copper wire a good choice?

Lease select the word from the list that best fits the definition - Represents information using percentages A.) Pictograph B.) Pie graph C.) Line graph D.) Bar Graph E.) Double bar graph

Many species of birds migrate in winter. Animals including bats, ground squirrels, and woodchucks hibernate in winter. Which of the following do hibernation and migration have in common? A.

What type of social organization developed in both pastoralist and agrarian societies?

What is the difference between parenting and parenthood

What characterized the african slave trade in the 15th century?