Solve the problem.The temperature of water in a certain lake on a day in October can be determined by using the model 
where x is the number of feet down from the surface of the lake and y is the Celsius temperature of the water at that depth. Based on this model, how deep in the lake is the water 8 degrees? (Round to the nearest foot.)
A. 13 ft
B. 69 ft
C. 43 ft
D. 32 ft
Answer: A
Mathematics
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Use Cramer's rule to solve the system. x + 2y - 3z + w = 7 3x + 4y - z + 2w = 4-2x + y + z - w = -3 x - y + 2z - 2w = 1
A. 
B. 
C. 
D. 
Mathematics
Factor the trinomial completely. If the trinomial cannot be factored, say it is prime.4t5 - 4t4 - 80t3
A. 4t3(t - 4)(t + 5) B. (t - 4)(4t4 + 20) C. (4t4 + 16)(t - 5) D. 4t3(t + 4)(t - 5)
Mathematics
Solve the equation.3x(8x - 7) = 0
A. 
, 0
B. - 
, 0
C. 
, 
, 0
D. 
, 
Mathematics
Solve the problem.Suppose $4000 is deposited into an account earning 5% annual interest, compounded continuously. Find the balance in the account at the end of 3 years.
A. $7288.48 B. $13,961.37 C. $21,177.96 D. $4647.34
Mathematics