Simplify where possible. Then solve the equation.2t = 
+ 19
A. t = 8
B. t = 11
C. t = 
D. t = 
Answer: A
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Solve the problem.The half-life of a certain radioactive substance is 13 years. Suppose that at time t = 0 , there are 20 g of the substance. Then after t years, the number of grams of the substance remaining will be N(t) = 20(1/2)t/26How many grams of the substance will remain after 39 years?
A. 0.88 g B. 1.77 g C. 7.07 g D. 3.54 g
Find the exact value of the expression without the use of a calculator.tan 205° + tan 315° - tan 25°
A. 0 B. 0.5 C. 1 D. -1
Solve the problem.A lot is in the shape of a right triangle. The shorter leg measures 90 m. The hypotenuse is 30 m longer than the length of the longer leg. How long is the longer leg?
A. 90 m B. 120 m C. 180 m D. 150 m
Divide. Leave your answer in exponent form. Assume that all variables in any denominator are nonzero.
A. 144x3y7
B. 
C. 
D. 