Solve the system by substitution.5x + 3y = 80 2x + y = 30
A. {(0, 0)}
B. {(0, 10)}
C. {(10, 0)}
D. {(10, 10)}
Answer: D
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Choose the equation that matches the graph.
A. 16x2 - 9y2 = 144 B. 9x2 + 16y2 = 144 C. 9x2 - 16y2 = 144 D. 16x2 + 9y2 = 144
A certain tree grows by 2/t + e(-t2/2) feet per year, where t is the time in years. Use the trapezoidal rule with whole year intervals to estimate the total growth during the stated time interval.From t = 1 to t = 6
A. 4.516 ft B. 5.012 ft C. 5.286 ft D. 4.183 ft
Provide an appropriate response.Identify the variable and the constant in this expression: 
A. variable 8x; constant 2x3 B. variable 11; constant x C. variable x; constant 11 D. variable x; constant 8x
Solve the problem.A lumber yard has fixed costs of $2590.80 per day and variable costs of $0.34 per board-foot produced. Lumber sells for $1.54 per board-foot. How many board-feet must be produced and sold daily to break even?
A. 1378 board-feet B. 7620 board-feet C. 2159 board-feet D. 1439 board-feet