Solve the problem.How many ounces of a 30% saline solution must be added to 40 ounces of a 13% saline solution to make a 20% saline solution?
A. 1 oz
B. 28 oz
C. 4 oz
D. 70 oz
Answer: B
Mathematics
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Translate the sentence to an equation using the variable x. Then solve the equation.When 
of a number is added to 24, the result is 28.
A. 
+ x = 28; 28
B. 28 + 
x = 24; 16
C. 
x - 24 = 28; 208
D. 24 + 
x = 28; 16
Mathematics
Solve for the indicated variable.I = 
( 1 - e-wR/3), for R
Express the answer using ln.
A. R = 
B. R = 
C. R = 
D. R = 
Mathematics
Determine whether the following is a probability model.
A. Yes B. No
Mathematics
Find an equation for the indicated ellipse.Foci (±3, 0) and vertices (±8, 0)
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Mathematics