Provide an appropriate response.The expression 7 - 2y is the same as -2y + 7. Why is this so?
What will be an ideal response?
Addition is commutative, so changing the order of the addends does not change the sum.
Mathematics
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Match the given equation with one of the graphs.
- 
= 1
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.The pH of a solution ranges from 0 to 14. An acid has a pH less than 7. Pure water is neutral and has a pH of 7. The pH of a solution is given by 
where x represents the concentration of the hydrogen ions in the solution in moles per liter. Find the pH if the hydrogen ion concentration is 
A. -3 B. 3 C. -11 D. 11
Mathematics
Perform the indicated operations.-11 + (5 ? 2 + 20) ÷ 5
A. 3 B. 1 C. -5 D. 5
Mathematics
Use radical notation to write the expression. Do not simplify.p-9/10
A. -
B. 
C. -
D. 
Mathematics