Find the net cost. Round to the nearest cent.$780 less 10/10/20/30
A. $353.81
B. $710.00
C. $390.00
D. $234.00
Answer: A
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Use a graphing calculator and the method of matrix inverses to solve the system. Give 5 decimal places.x - 
y =3.72.85x + y = -8.23
A. {(0, 0)} B. {(2.61630, -2.88772)} C. {(-1.57817, -3.73223)} D. {(3.43297, 0.18882)}
Rewrite the equation in a rotated x'y'-system without an x'y' term. Express the equation involving x' and y' in the standard form of a conic section.24xy - 7y2 + 36 = 0
A. 
+ 
= 1
B. 
- 
= 1
C. 
- 
= 1
D. 
- 
= 1
Graph the equation.y2 = -20x
A. 
B. 
C. 
D. 
Solve the problem.A surveyor standing 66 meters from the base of a building measures the angle to the top of the building and finds it to be 39°. The surveyor then measures the angle to the top of the radio tower on the building and finds that it is 49°. How tall is the radio tower?
A. 22.48 m B. 11.64 m C. 8.28 m D. 7.99 m