For the following systems of equations in echelon form, tell how many solutions there are in nonnegative integers.x + 3y + 4z = 80 4y + 5z = 104
A. 4
B. 3
C. 5
D. 2
Answer: B
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Solve and check. Begin by using the addition or multiplication principles of equality to isolate the squared term. 8z2 + 2 = 650
A. 9 B. 325 C. ±9 D. ±10
Use Cramer's rule to solve the linear system. If D = 0, use another method to determine the solution set.6x - 7y = 494x + 2y = -14
A. {(0, -7)} B. Cramer's rule does not apply since D = 0; ? C. {(-1, -6)} D. {(0, -6)}
Find an equation for the hyperbola described. Graph the equation.Center at (0, 0); focus at (2
, 0); vertex at (4, 0)
A. 
- 
= 1
B. 
- 
= 1
C. 
- 
= 1
D. 
- 
= 1
Solve the problem. Use 3.14 as the approximate value of ? unless otherwise instructed. Round to the nearest tenth unless otherwise indicated.A cylindrical drain pipe is 3 in. across the top and about 8 in. high. How many cubic inches of water could it hold?
A. 226.1 in.3 B. 56.5 in.3 C. 150.7 in.3 D. 113.0 in.3