Perform the indicated row operation on the given augmented matrix.-2R1 + R2 ? R2: 
A. 
B. 
C. 
D. 
Answer: A
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In a polyhedron, the relationship between numbers of vertices V, edges E, and faces F is found in Euler's equation 
.
Answer the following statement true (T) or false (F)
Use the order of operations to simplify the expression.
÷ 
A. 
B. 
C. 
D. 
Use substitution to factor the polynomial.(s3 + 2)2 + 10(s3 + 2) + 25
A. (s3 + 7)(s3 - 7) B. (s + 7)2 C. (s3 + 7)2 D. (s3 - 7)2
Solve the problem using the quadratic formula.When water runs out of a hole in a cylindrical container, the height of the water in the container can often be modeled by a quadratic function. Assume that the height of the water in a particular metal can with a small hole can be modeled by h = 0.0003x2 - 0.16x + 8, where x is the time (sec) and h is the height (cm). Use the quadratic formula to estimate the time when the height is 2 cm. Round your answer to the nearest second.
A. 48 sec B. 47 sec C. 45 sec D. 41 sec