Solve.A chemist needs 5 liters of a 50% salt solution. All she has available is a 20% salt solution and a 70% salt solution. How much of each of the two solutions should she mix to obtain her desired solution?
A. 2 liters of the 20% solution; 3 liters of the 70% solution
B. 2.5 liters of the 20% solution; 2.5 liters of the 70% solution
C. 1 liters of the 20% solution; 4 liters of the 70% solution
D. 1.5 liters of the 20% solution; 3.5 liters of the 70% solution
Answer: A
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A. 
mpg
B. 1264
mpg
C. 32
mpg
D. 245 mpg
Write the standard form of the equation of the circle described.Center (0, 5), r = 10
A. x2 + (y + 5)2 = 10 B. (x - 5)2 + y2 = 100 C. (x + 5)2 + y2 = 100 D. x2 + (y - 5)2 = 100
Use the order of operations to simplify the expression.240 ÷ 6 - 3
A. 231 B. 37 C. 237 D. 80
Use the given conditions to write an equation for the line in the indicated form.Passing through (4, 5) and parallel to the line whose equation is 
;point-slope form
A. y - 5 = 2(x - 4) B. y - 4 = 2(x - 5) C. y = 2x D. y - 5 = x - 4