Find the sum or difference.(5x4 - 9x2 + x) - (2x3 + 8x2 + 3x) + (4x2 - x)
A. 11x5 + 7x4 - 3x
B. 5x4 - 2x3 - 13x2 - 3x
C. 5x4 + 2x3 - 21x2 - 3x
D. 5x4 - 2x3 - 11x2 + 3x
Answer: B
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Construct a decimal number by writing and multiply by 3. 1 in the tenths column,1 in the thousandths column,8 in the tens column,1 in the thousands column,2 in the hundreds column,5 in the hundredths column,5 in the ten thousandths column,1 in the ones column.
A. 3825.4545 B. 3843.4545 C. 3843.4605 D. 2343.4545
Solve the problem using determinants.Linear systems occur in the design of roof trusses for new homes and buildings. The simplest type of roof truss is a triangle. The truss shown in the figure is used to frame roofs of small buildings. If a 128-pound force is applied at the peak of the truss, then the forces or weights W1 and W2 exerted parallel to each rafter of the truss are determined by the following linear system of equations. 
W1 + 
W2 = 256
-4.0px;" />W1 - 
W2 = 0Find W1 and W2.
A. W1 = 93.7 lb; W2= 114.76 lb
B. W1 = 114.76 lb; W2= 93.7 lb
C. W1 = 128 lb; W2= 156.77 lb
D. W1 = 46.85 lb; W2= 57.38 lb
Given f(x) = 
+ 6x.
(a) Find the intervals on which f is increasing or decreasing. (b) Find the relative maxima and relative minima of f. a. (a) Increasing on (?3, ?), decreasing on (?? , ?3) (b) Rel. min. f(?3) = ?9 b. (a) Increasing on (?? , ?3), decreasing on (?3, ?) (b) Rel. max. f(?3) = ?9 c. (a) Increasing on (?6, ?), decreasing on (?? , ?6) (b) Rel. min. f(?6) = 0 d. (a) Increasing on (?? , ?6), decreasing on (?6, ?) (b) Rel. max. (f(?6) = 0
Solve the system by elimination, or by any convenient method.
?
?
A. ( -6, 4) B. ( 3, 6) C. ( 0, -6) D. ( -6, 3) E. There is no solution to the equations.