Solve the problem.A brick staircase has a total of 20 steps The bottom step requires 146 bricks. Each successive step requires 5 fewer bricks than the prior one. How many bricks are required to build the staircase?
A. 3870 bricks
B. 1970 bricks
C. 3940 bricks
D. 1920 bricks
Answer: B
Mathematics
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Solve the problem.For what value of r does the infinite series 1 + 5r + 7r2 + 5r3 + r4 + 5r5 + 7r6 + 5r7 + r8 + . . . converge?
A. |r| < 
B. |r| < 6
C. |r| < 
D. |r| < 1
Mathematics
Simplify the radical expression. Assume all variables represent positive real numbers.
A. 
B. 7
C. 2401
D. not a real number
Mathematics
Solve.Each month you save 
, which is 
of your monthly income, m. Write an equation that could be used to find your monthly income.
A. 
m = 69
B. m - 
= 69
C. m = 
? 69
D. 6m = 69
Mathematics
Divide.
A. 5y2 - 2y + 1 B. 5y2 + 2y C. 5y2 - 1 D. 5y2 + 2y - 1
Mathematics