Simplify the expression. Assume that all variables are positive when they appear.
A. - 
B. - 
C. -9
D. -40
Answer: B
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Provide an appropriate response.Write the equation of the line shown on the graph. 
A. y = -3 B. y = 3 C. x = 3 D. y = x + 3
Solve.My Popper, Inc., is planning a new popcorn popper. For the first year, the fixed cost of setting up the production line is $2700. The variable cost for producing each popper is $21. The revenue from each popper is $22. Find the profit or loss from the production and sale of 2300 poppers.
A. $5000 profit B. -$400 profit C. $6,159,421 loss D. $96,200 profit
Identify the equation as either an identity or not.-2 cos 10x cos 4x = cos 7x cos 3x
A. Not an identity B. Identity
The pH of a solution is given by the formula 
, where 
is the concentration of hydrogen ions in moles per liter in the solution. Use this formula to solve the problem.The pH value of a substance is 5.42. Find the hydrogen-ion concentration for this substance.
A. 263,026.8 B. 0.0000038 C. 1.7 D. 0.2