Solve the system of two equations in two variables. x - 4y = 20-3x - 3y = 15
A. (1, -6)
B. (5, 0)
C. (0, -5)
D. No solution
Answer: C
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Provide an appropriate response.The standard normal probability density function is defined by f(x) = 
e- x2/2. (a) Use the fact that 
dx = 1 to show that 
dx =
.(b) Use the result in part (a) to show that the standard normal probability density function has variance 1.
What will be an ideal response?
Sketch the graph of the power function by hand, using a calculator only to evaluate y-values for your chosen x-values. On the same axes, graph y = x2 using a dotted line for comparison. In each case, x ? 0.f(x) = x2.3
A. 
B. 
C. 
D. 
Use Heron's formula to find the area of the triangle. Round to the nearest square unit.a = 17 yards, b = 20 yards, c = 13 yards
A. 110 square yards B. 116 square yards C. 119 square yards D. 113 square yards
Solve.3
= 
A. 10 B. 5 C. 2 D. empty set solution