Write the expression in terms of sine and cosine, and simplify so that no quotients appear in the final expression.sin2 x(cot2 x + 1)
A. -1
B. tan2 x
C. 1
D. cos2 x + 1
Answer: C
Mathematics
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Provide an appropriate response.Which number is closest to 2.3?
A. 2.4 B. 2.387 C. 2.287 D. 2.2
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. -10 B. -4 C. 4 D. 10
Mathematics
Solve the system by any method.0.5x - 0.1y = -0.2-0.1x - 0.1y = 0.4
A. {(2.3, 1.5)} B. {(-1, -3)} C. ? D. {(-1.6, -0.7)}
Mathematics
Find the product.(y - 10)(y2 + 10y - 10)
A. y3 + 90y - 100 B. y3 - 110y + 100 C. y3 + 20y2 + 110y - 100 D. y3 - 20y2 - 110y + 100
Mathematics