The nurse has 2.82 liter(s) of a solution that is 42.4% alcohol. How many liters of pure alcohol must she add to bring the solution up to a 78.4% concentration?
?
Please enter your answer as a number without the units. Round your answer to the nearest tenth.
Fill in the blank(s) with the appropriate word(s).
4.7
Mathematics
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Find the slope of the line tangent to the curve at the given value of x.f(x) = - 
; x = -4
A. 
B. 
C. 
D. 
Mathematics
Simplify the radical expression by factoring out the largest perfect nth power. 
A. 4
B. 2
C. 2 + 
D. Not a real number
Mathematics
Solve the problem.A man who is between the ages of 65 and 90 says that his age is a prime number and that two years ago it was also a prime number. How old is the man?
A. 83 B. 71 C. 73 D. 79
Mathematics
The augmented matrix is in row-echelon form and represents a system of linear equations. Solve the system using back-substitution.
A. {(60, -21, 5)} B. {(60, -23, 5)} C. ? D. {(65, -23, 5)}
Mathematics