Solve the system of equations by the substitution method. Check your solutions. For any dependent equations, write your answer in the ordered pair form.
A. {(1, 1)}
B. {(1, 0)}
C. {(0, 0)}
D. {(0, 1)}
Answer: D
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Provide an appropriate response.Perform the indicated operations and simplify: 
+ 
+ 
Fill in the blank(s) with the appropriate word(s).
Write an expression in simplest form for the perimeter of the shape.
A. 8x + 28 B. x(x + 7) C. 2x + 7 D. 4x + 14
Solve the problem.Vehicles in accidents often leave skid marks. To determine how fast a vehicle was traveling, officials often use a test vehicle to compare skid marks on the same section of road. If a vehicle involved in a crash left skid marks that are D feet long and a test vehicle traveling at v miles per hour leaves skid marks that are d feet long, then the speed of the vehicle in the crash is given by 
Determine V if v = 50 miles per hour, D = 289 feet, and d = 100 feet.
A. 80 miles per hour B. 85 miles per hour C. 170 miles per hour D. 95 miles per hour
Graph the function.f(x) = -x4 - 3x2
A. 
B. 
C. 
D. 