Solve the problem.A chemist needs 120 milliliters of a 69% solution but has only 61% and 73% solutions available. Find how many milliliters of each that should be mixed to get the desired solution.
A. 50 mL of 61%; 70 mL of 73%
B. 80 mL of 61%; 40 mL of 73%
C. 70 mL of 61%; 50 mL of 73%
D. 40 mL of 61%; 80 mL of 73%
Answer: D
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Solve the system by elimination. If the system is inconsistent or dependent, say so. 7x - 9y = 5-21x + 27y = -20
A. 
B. (3, 4)
C. infinite number of solutions of the equation 7x - 9y = 5; dependent system
D. empty set solution; inconsistent system
Solve by using the Superposition Theorem:
R1 = 4.7 Kê, R2 = 3.3 Kê, R3 = 5.1 Kê, E1 = 40 V, and E2 = 20 V. Find VR .
3
a. 19.28 V
b. 20.46 V
c. 21.21 V
d. 32.81 V
e. 37.05 V
Provide an appropriate response.Alice's age 15 years ago can be expressed as:
A. 2A - 15 B. A + 15 C. 2A + 15 D. A - 15
Simplify.
A. 
B. 
C. 
D. 