4565000000 in scientific notation

Given: circle a externally tangent to circle b. how many possible common tangents to circles a and b can exist? 2 3 4

All of the following are reasons why deserts extremely susceptible to wind erosion except a. they lack major root systems b. they contain thin, dry soil c. they have very few plants and trees d. they are extremely hot and lack water

Which of the following statement about women in the workforce is false