Simplify the polynomial by combining like terms.
x2 + 
x + 
+ 
x2 - 
x - 
A. 
x2 - 
x - 
B. 
x4 + 
x2 - 
C. 
x2 + 
x - 
D. 
x6 - 
Answer: C
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Decide whether the given number is a solution to the equation preceding it.3m + 7 = 21; 4
A. No B. Yes
Use Cramer's rule to solve the system. If D = 0, use another method to complete the solution. x + y + z + w = 7 3x - 2z + 5w = 11-4x + 3y + w = 4 -x - y - z - w = 6
A. ?
B. 
C. 
D. 
Solve for the specified variable.I = 
for n
A. n = 
B. n = 
C. n = IR - E + Ir
D. n = 
Solve the problem.The height of a triangle is 2 centimeters less than its base. If the area of the triangle is 39 square centimeters, find the base and height of the triangle. Round to the nearest tenth of a centimeter if necessary.
A. base: 7.9 cm, height: 5.9 cm B. base: 7.9 cm, height: 9.9cm C. base: 11.9 cm, height: 9.9 cm D. base: 9.9 cm, height: 7.9 cm