Solve.The decay of 509 mg of an isotope is given by 
, where t is time in years. Find the amount left after 95 years.
A. 501
B. 121
C. 122
D. 61
Answer: C
Mathematics
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Decide whether or not the given equation is an identity.tan(90° + x) = -cot x
A. Yes B. No
Mathematics
Solve the exponential equation using the method of "relating the bases" by first rewriting the equation in the form 
= 
A. 
B. 
C. 
D. 
Mathematics
Write the division problem using two other symbols.
A. 18 ÷ 6 = 3; 
= 3
B. 
= 18; 6 ÷ 3 = 18
C. 6 × 3 = 18; 
D. 18 ÷ 3 = 6; 
= 6
Mathematics
Write the negation of the statement. ? All Squares are rectangles. ?
A. No Squares are rectangles. B. Some Squares are rectangles. C. Some Squares are not rectangles. D. Squares are not rectangles. E. none of these
Mathematics