Add or subtract as indicated. Simplify, if necessary.
- 
A. 
B. 
C. 8z - 9
D. 
Answer: D
Mathematics
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Solve the problem below by setting up and solving a system of two linear equations in two variables.A 13% salt solution is to be mixed with a 18% salt solution to produce 10 gallons of a 16% salt solution. How many gallons of the 13% solution and how many gallons of the 18% solution will be needed?
A. 3 gallons of 13% and 5 gallons of 18% B. 8 gallons of 13% and 10 gallons of 18% C. 16 gallons of 13% and 18 gallons of 18% D. 4 gallons of 13% and 6 gallons of 18% E. 18 gallons of 13% and 20 gallons of 18%
Mathematics
Solve.t2 - 6 = -
A. ±
, ±
B. ±
C. ±
D. 
, 
Mathematics
Graph the polar equation.r = 5 cos ? - 6 sin ?
A. 
B. 
C. 
D. 
Mathematics
Find the sum.-22 + 6
A. 28 B. -16 C. -28 D. 16
Mathematics