Solve the system by substitution.9x + 4y = 3 9y = 26 + 2x
A. 
B. 
C. 
D. 
Answer: A
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Find the product.(5x - 7y)2
A. 25x2 - 70xy + 49y2 B. 25x2 + 49y2 C. 5x2 + 49y2 D. 5x2 - 70xy + 49y2
Use a calculator or computer program to approximate the value of y(T) using Euler's method with the given time step on the interval [0, T]. Then, using the exact solution given, find the error in the approximation to y(T) (only at the right endpoint of the time interval). Round answers to five decimal places, do not use intermediate rounding.y'(t) = -3y, y(0) = 1; ?t = 0.2, T = 1; y(t) = e-3t
A. y(1) ? 0.01024; 0.20000 B. y(1) ? 0.01024; 0.04979 C. y(1) ? 0.02560; 0.02419 D. y(1) ? 0.01024; 0.03955
Find the coordinates of the vertex of the quadratic function.f(x) = -4x2 - 8x - 9
A. (-2, -17) B. (1, -21) C. (2, -41) D. (-1, -5)
Write as the sum and/or difference of logarithms. Express powers as factors.ln 
2/3, x > 9
A. ln (x + 2) + ln (x - 9) + ln 2 - 4ln (x - 5) - ln 3
B. 
ln (x2 + 11x - 18) - 
ln (x - 5)
C. 2ln (x + 2) - 3ln (x - 9) - 
ln (x - 5)
D. 
ln (x + 2) + 
ln (x - 9) - 
ln (x - 5)