Write the ratio in simplest form.A molecule of ethanol is composed of two atoms of carbon, six atoms of hydrogen, and one atom of oxygen. What is the ratio of oxygen atoms to total atoms in a molecule of ethanol?
A. 
B. 
C. 
D. 
Answer: B
Mathematics
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Evaluate the integral.
A. 32 B. 18 C. 9 D. 16
Mathematics
Solve the problem.A chemist needs to mix a 20% acid solution with a 70% acid solution to obtain 8 liters of a 50% acid solution. How many liters of each of the solutions must be used?
A. 1.6 L of the 20% solution; 6.4 L of the 70% solution B. 2.4 L of the 20% solution; 5.6 L of the 70% solution C. 4 L of the 20% solution; 4 L of the 70% solution D. 3.2 L of the 20% solution; 4.8 L of the 70% solution
Mathematics
Find the sum. Simplify when necessary.(-16) + (-17) + 9
A. 8 B. -24 C. 10 D. 42
Mathematics
Clear fractions then solve by substitution.
+ 
= 4
- 2y = 21
A. {(-6, 8)} B. {(6, -8)} C. {(x, y)| 7x + 5y = 48} D. ?
Mathematics