Divide.34.4 ÷ 8.6
A. 5
B. 0.4
C. 40
D. 4.0
Answer: D
Mathematics
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Find the real solutions, if any, of the equation. Use the quadratic formula.x2 + 4x - 7 = 0
A. {-2 - 2
, -2 + 2
}
B. {2 + 
}
C. {-2 - 
, -2 + 
}
D. {-1 - 
, -1 + 
}
Mathematics
Identify where f is increasing or where f is decreasing, as indicated. Round your answer to two decimal places when appropriate.f(x) = 
; increasing
A. (-?, ?) B. [-0.80, 0.80] C. (-?, 0.80] D. [0.80, ?)
Mathematics
Find all values that make the expression undefined.
A. 20 B. 0 C. -5 D. 4
Mathematics
Solve the problem.A sample of 550 grams of radioactive substance decays according to the function 
where t is the time in years. How much of the substance will be left in the sample after 20 years? Round to the nearest whole gram.
A. 1 g B. 964 g C. 215 g D. 0 g
Mathematics