Solve.After being struck with a hammer, a gong vibrates 40 vibrations in the first second and in each second thereafter makes 
as many vibrations as in the previous second. Find how many vibrations the gong makes before it stops vibrating.
A. 240 vibrations
B. 250 vibrations
C. 48 vibrations
D. 43 vibrations
Answer: A
Mathematics
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Decide whether the expression has been simplified correctly.
3 = 
A. Yes B. No
Mathematics
Simplify. Write your answer in the form a + bi, where a and b are real numbers.(-9 + 14i) - (6 - 4i)
A. 3 - 18i B. -15 + 18i C. -3 - 18i D. -15 - 18i
Mathematics
Determine whether the given expression is a polynomial. If it is, write it in standard form.x2 + x4 - x3 + 2
A. Yes; x4 - x3 + x2 + 2 B. No
Mathematics
Evaluate.loga a-9
A. -9loga a B. -9 C. a-9 D. 1
Mathematics