Simplify, if possible.
A. 
B. 
C. 
D. 
Answer: C
Mathematics
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Use a calculator to find the acute angle between the planes to the nearest thousandth of a radian.5x + 2y + 4z = -10 and 6x + 5y + 9z = 9
A. 1.256 rad B. 0.315 rad C. 1.433 rad D. 1.370 rad
Mathematics
Use a graphing calculator to find the inverse of the matrix. Give five decimal places, if necessary.A = 
A. 
B. 
C. 
D. 
Mathematics
Perform the indicated operation and reduce to lowest terms.
- 
A. 
B. 
C. 
D. 
Mathematics
Solve and check.
+ 4 = x
A. No solution
B. 
C. 
D. - 
Mathematics