Simplify the expression.21 + (7 ? 12) - 15
A. 321
B. -84
C. 90
D. 25
Answer: C
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Factor by grouping.x3 + 5x2 + 7x + 35
A. (x2 + 7)(x - 5) B. (x2 + 7)(x + 5x) C. (x3 + 7)(x + 5) D. (x2 + 7)(x + 5)
Find the exact value of the sum.sin 15° - sin 105°
A. - 
B. 
C. - 
D. - 
Write the system in the form 
Then solve the linear system by computing 
with a calculator. Round numbers to the nearest tenth, as necessary.2.6x - 0.7y + 5.3z - 3.4w = 12.9 6.5y + 0.7w = -1.8 4.0z - 2.2w = 1.54.9x + 0.6w = 3.2
A. (2.2, 1.1, 7.2, 12.4) B. (-2.2, 1.1, -6.4, 23.3) C. (2.2, -1.1, -6.4, 7.6) D. (2.2, 1.1, -6.4, -12.4)
Solve the problem.Approximate the area under the graph of f(x) = x2 from 0 to 4 by partitioning the interval into 4 subintervals of equal length and choosing t to be the right endpoint.
A. 30 B. 36 C. 33 D. 27