The difference of two numbers is 8. When twice the first number is added to three times the second number, the result is 51. What are the two numbers?
A. 12 and 4
В.15 and 7
C. 20 and 12
D. 23 and 15

He mass of a single atom of carbon can be found by dividing the atomic mass (12.01 g) by 6.022 x 10^23. which is the mass of a single carbon atom, correctly written in scientific notation with the correct number of significant figures?

What is the value of n in the equation -1/2(2n+4)+6=-9+4(2n+1)

Solve the following: 12(x^2–x–1)+13(x^2–x–1)=25(x^2–x–1) 364x–64x=300x