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12. Simplify the complex rational expression.    

7. Perform the indicated operation and simplify.  

13. Solve the equation.  

Which of the following structures propel live sperm from their storage sites?

The renal pyramids are located in the renal cortex. 

The __________ helps cushion and protect the kidneys while also holding them in place.

The ____________ kidney is slightly higher due to displacement by the liver. 

Rewrite the following statements including the while-statement so it does the same calculation but uses only a for-statement: no while-statements are allowed: sum=0num = 1000while num > 500:   if num % 5 == 0:       sum = sum + num   num = num – 2  

Define a Python function check_sum (a, b, c) with three int arguments a, b, c. When called passing specific values for a, b, and c, your function should return True when the sum of any two of the three passed arguments is equal to the third argument.  Otherwise, your function should return False. For example, check_sum (1,2,3) should return True, since 1+2==3. check_sum (1,1,1) should return False, since 1+1 != 1.  

The potential energy for the interaction between the two atoms in a diatomic molecule is U = A/x12 – B/x6, where A and B are constants and x is the interatomic distance. The magnitude of the force that one atom exerts on the other is: