Find the sum.Find the sum of the first 30 terms of the arithmetic sequence: 13, 8, 3, -2, . . .
A. -1785
B. -137
C. -1777
D. -1860
Answer: A
Mathematics
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Combine like terms.5x + 7x
A. 24x B. 12x2 C. 12x D. 35x
Mathematics
Find a value of ? in [0°, 90°] that satisfies the statement. Leave answer in decimal degrees rounded to seven decimal places, if necessary.sin ? = 0.81107642
A. 54.2012343° B. 125.798766° C. 35.7987657° D. 234.201234°
Mathematics
Solve the problem.Find a unit vector normal to the plane containing u = -i + j + 4k and v = 2i - 3j + k.
What will be an ideal response?
Mathematics
Find the inverse of the matrix.
A. 
B. 
C. 
D. 
Mathematics