Solve the equation.3x - 4x + 3x = -70
A. x = -35
B. x = -72
C. x = 17.5
D. x = 0
Answer: A
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Find the required ratio.The atomic mass of an atom of carbon is defined to be 12 u. The ratio of the atomic mass of an atom of bromine to that of an atom of carbon is 
. What is the atomic mass of an atom of oxygen? (The symbol u represents the unified atomic mass unit, where 1 u = 1.66 × 10-27 kg.)
A. 40 u B. 80 u C. 160 u D. 82 u
Find the compound interest earned by the deposit. Round to the nearest cent.$7870 at 11% compounded semiannually for 12 years
A. $20,576.82 B. $10,388.40 C. $19,662.81 D. $7092.50
Evaluate the required second order partial derivative.Find fxy(3, -1), if f(x, y) = 4xe2y.
A. 8.661 B. 1.083 C. 0 D. 4.331
Solve the system by substitution. 3u + v = 32u - 2v = -4
A. u = 
, v = 
B. u = 
, v = 
C. u = 
, v = - 
D. u = - 
, v = 