Multiply and, if possible, simplify.
? 
A. 14x
B. 9
C. 2
D. 7
Answer: D
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Solve the system using the inverse of the coefficient matrix of the equivalent matrix equation. 9x + 9y - z = 124 x + 4y - 6z = 23 6x + y + z = 51
A. (7, 2, 7) B. (7, 7, 2) C. (-7, 7, 14) D. No solution
In a suspension bridge, the shape of the suspension cables is parabolic. The bridge shown in the figure has towers that are 800 m apart, and the lowest point of the suspension cables is 200 m below the top of the towers. Find the equation of the parabolic part of the cables, placing the origin of the coordinate system at the lowest point of the cable.
?
NOTE: This equation is used to find the length of the cable needed in the construction of the bridge.
?
What will be an ideal response?
Solve the problem.Sue rowed her boat across Lake Bend and back in 3 hours. If her rate returning was 2 mph less than the rate going, and if the distance each way was 7 miles, find her rate going.
A. 5.9 mph B. 1.5 mph C. 3.7 mph D. 5.5 mph
Solve the problem.A lumber yard has fixed costs of $6510.60 per day and variable costs of $0.6 per board-foot produced. Lumber sells for $2.40 per board-foot. How many board-feet must be produced and sold daily to break even?
A. 2170 board-feet B. 2411 board-feet C. 10,851 board-feet D. 3617 board-feet