Provide an appropriate response.Which of the following are not allowable operations when the Gaussian elimination method is used to solve a system of linear equations?(i)A multiple of elements of one row may be added to the corresponding elements of any other row.(ii)Any two columns may be interchanged.(iii)The elements of any row may be multiplied by the corresponding elements of another row.(iv)All of the elements of any row may be multiplied by any nonzero number.
A. (i), (iv)
B. (ii), (iii)
C. (ii), (iii), (iv)
D. (ii)
Answer: B
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Subtract using columns.Subtract (4x9 - 9x8 - 2x7 + 2) from (9x9 - 5x8 + 4x7 - 4).
A. 5x9 - 14x8 + 2x7 - 2 B. 5x9 + 4x8 + 6x7 - 6 C. 13x9 - 14x8 + 2x7 - 6 D. 13x9 - 14x8 + 2x7 - 2
Decide whether or not the given equation is an identity.cos(x + y) cos(x - y) = cos2x - sin2y
A. Yes B. No
Solve.
x2 = 19
A. 1539, -1539
B. No solution
C. 9
, - 9
D. 
, - 
Solve the problem.
Jackie Rambler purchased a home for $124,000. Oakwood Mortgage Company approved her loan application for a 22-year fixed-rate loan at 6.25%. Jackie agreed to pay 20% of the purchase price as a down payment. How much interest would she have saved if she made the same loan with the same down payment for 12 years?
A. $41,521.15 B. $51,901.44 C. $43,592.45 D. $37,592.83