Use the indicated formula to find the sum.Use S = 
to find the sum of 20 + 21 + 22 + . . . + 625.
A. 195,454
B. 195,435
C. 194,829
D. 194,810
Answer: B
Mathematics
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Decide whether the statement makes sense. Explain your reasoning.The premises are true and the conclusion is true, so the argument must be valid.
What will be an ideal response?
Mathematics
Multiply.(n + 13)2
A. n2 + 169 B. n2 + 26n + 169 C. 169n2 + 26n + 169 D. n + 169
Mathematics
Use the substitution method or the elimination method to solve the system. If the system has infinitely many solutions, express the ordered pair in terms of x or y. x + 2y = 1-4x - 8y = -4
A. no solution
B. 
or (-2y + 1, y)
C. (0, 0)
D. (1, 0)
Mathematics
Multiply.(-5x + 4y)(2x - 10y + 1)
A. -10x2 + 50xy - 5x - 40y2 B. -10x2 + 58xy + 58y2 C. -10x2 + 58xy - 5x - 40y2 + 4y D. -10x2 + 8xy - 5x - 40y2 + 4y
Mathematics