Simplify the expression. Write the result using positive exponents only.(-5x5y-6)(3x-1y)
A. 
B. -15x4y7
C. 
D. 
Answer: A
Mathematics
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Solve the problem.A sample of 1,000 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 70 years? Round the answer to the nearest gram.
A. 77 g B. 106 g C. 9,393 g D. 29 g
Mathematics
Round the decimal to the given place value.23.1 (nearest whole number)
A. 24 B. 23 C. 22
Mathematics
Solve by addition or substitution. x - 2y = -72x - 3y = -13
A. (-6, 2) B. (-5, 1) C. (5, 2) D. ?
Mathematics
Simplify the expression. Write the result using positive exponents only.r-5
A. 
B. r1/5
C. - 
D. -r5
Mathematics