Solve the system of equations by substitution.
x - y = - 
x + 8y = -4
A. (-4, 0)
B. (0, 4)
C. (0, -4)
D. (4, 0)
Answer: A
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Solve the problem.Peter's Construction Company needs to cut an arch for the top of a doorway. The arch needs to be 14 feet wide and 4 feet high. The arch will be a section of a circle, drawn using a stretched string with a pencil attached at the end as a compass. Using the coordinate system as shown in the drawing, find the coordinates of the point that would be the center of the circle. Also find the radius of the circle. Round to the hundredths place.
?a = 7
A. (0, -4.13); 8.13 B. (0, -3.79); 7.79 C. (0, -41.25); 45.25 D. (0, -3.88); 7.88
Calculate the circulation of the field F around the closed curve C.F = xyi + 9j , curve C is r(t) = 5 cos ti + 5 sin tj , 0 ? t ? 2?
A. 0
B. 18
C. 
D. 
Simplify the expression.
- 
A. x + 5
B. 
C. 
D. 
Write a polynomial function of minimum degree with real coefficients whose zeros include those listed. Write the polynomial in standard form.-3i and 
A. f(x) = x4 + 6x2 - 27 B. f(x) = x4 + 12x2 + 27 C. f(x) = x4 - 12x2 + 27 D. f(x) = x4 - 6x2 - 27