Multiply the polynomials using the special product formulas. Express the answer as a single polynomial in standard form.(x - 9y)2
A. x2 - y2
B. x2 - 9xy + 81y2
C. x2 - 18xy + 81y2
D. x2 + 18xy + 81y2
Answer: C
Mathematics
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A. Yes B. No
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Find the sum.-23 + [23 + (-3)]
A. -3 B. 43 C. 49 D. 3
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Factor the expression completely.y2 - 11y + 18
A. (y + 2)(y + 9) B. (y - 2)(y + 9) C. (y - 18)(y - 1) D. (y - 2)(y - 9)
Mathematics
Solve the problem.A sample of 400 g of lead-210 decays to polonium-210 according to the function given by 
where t is time in years. What is the amount of the sample after 60 years (to the nearest g)?
A. 43 g B. 59 g C. 2728 g D. 167 g
Mathematics