Solve the problem.For the table below, compute the mass of 768 grams of radioactive element D left each day if element D loses 80% of its mass every day. What type of decay is this? 
A. 
; exponential
B. 
; linear
C. 
; linear
D. 
; exponential
Answer: D
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Provide an appropriate response.Use the fundamental identity cosh2 x - sinh2 x = 1 to verify the identity. 1 - tanh2 x = sech2 x
What will be an ideal response?
Solve the problem.In a home economics class, students cut triangular pieces of fabric for a quilt. Each triangle had a base of 18 centimeters and an altitude of 15 centimeters. What was the area of each triangular piece of fabric?
A. 270 square centimeters B. 540 square centimeters C. 16.5 square centimeters D. 135 square centimeters
Solve the equation.9x - (3x - 1) = 2
A. 
B. 
C. 
D. 
Perform the indicated operations and write the answer in the form 
where a and b are real numbers.2i(4 - 9i)
A. 8i - 18i2 B. 18 + 8i C. 8i - 18 D. 8i + 18i2