Solve the system of equations by Gauss-Jordan elimination.
A. {(30, 20, -10)}
B. {(20, 10, 0)}
C. {(15, 5, 5)}
D. ?
Answer: C
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Find the intervals on which the function is continuous.y = 
A. continuous on the interval [
, ?)
B. continuous on the interval [-
, 
]
C. continuous on the intervals (-?, -
] and [
, ?)
D. continuous everywhere
Evaluate the function for the given values of a and b. Then use the intermediate value theorem to determine which of the statements below is true.a = -1 and b = 0f(x) = 3x3 - 9x2 - 2x + 8
A. f(-1) and f(0) have the same sign, therefore the intermediate value theorem cannot be used to determine whether the function f has a real zero between -1 and 0. B. f(-1) and f(0) have opposite signs, therefore the function f does not have a real zero between -1 and 0. C. f(-1) and f(0) have the same sign, therefore the function f has a real zero between -1 and 0. D. f(-1) and f(0) have opposite signs, therefore the function f has a real zero between -1 and 0.
Simplify the expression.
?
?
A. ?
?
B. ?
C. ?
D. ?
E. ?
First, round the mixed numbers to the nearest whole number and estimate the answer. Then find the exact answer and write it in simplest form.5
? 9
A. 56
B. 53
C. 57
D. 45