Translate the problem to a system of equations, then solve using matrices.How many liters (L) of a 10% alcohol solution must be mixed with 30 L of a 70% solution to get a 40% solution?
A. 6 L
B. 30 L
C. 3 L
D. 60 L
Answer: B
Mathematics
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Find the equation of the line described. Write the equation in slope-intercept form, if possible.(-6, 6); slope = -4
A. y = -4x - 18 B. x = -4y + 18 C. y = -4x + 18 D. x = -4y - 18
Mathematics
Eva invested a certain amount of money at 15% interest and $2,000 more than that amount at 16%. Her total yearly interest was $1,715. How much did she invest at each rate?
A. $2,000 at 15%, $4,500 at 16% B. $4,500 at 15%, $6,500 at 16% C. $4,700 at 15%, $6,300 at 16% D. $4,700 at 15%, $6,700 at 16% E. $6,500 at 15%, $4,500 at 16%
Mathematics
Solve the rational equation.
= 
A. -3 B. 3 C. 1 D. -1
Mathematics
Multiply.0.0041
A. 0.0003608 B. 0.3608 C. 0.003608 D. 0.03608
Mathematics