Solve the equation.-4a + 3 + 5a = 9 - 30
A. 24
B. -24
C. -42
D. 42
Answer: B
Mathematics
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Find the derivative of y with respect to x.y = tan-1 
A. 
B. 
C. 
D. 
Mathematics
Solve.An equation that can be used to predict the median age N (in years) of the population of the United States is N = 33.62 + 1.0249 ln x, where x is the number of years. Use the equation to find the median age of the U.S. population in 12 years. If necessary, round to the nearest hundredth.
A. 33.62 B. 36.105 C. 36.167 D. 34.726
Mathematics
Add. Write the answer in lowest terms as a mixed number.
A. 42
B. 41
C. 41
D. 40
Mathematics
Find the pH of a solution with a hydrogen ion concentration of 
gram-ions per liter.
?
Please give the answer to two decimal places.
Fill in the blank(s) with the appropriate word(s).
Mathematics