Write the number in decimal notation without the use of exponents.-5.57 × 105
A. 557,000
B. -5,570,000
C. -55,700
D. -557,000
Answer: D
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A child is 22 inches long at birth and grows to an adult height of 70 inches.
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A: Make a logistic model of the height H, in inches, at age t years. Note: Thus far you are not given sufficient information to determine the value of r in the expression 
. Just leave that term as a variable.
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B: In the model from part A we think of restricting the age to 15. That corresponds to putting 
in the formula, so H is a function of r. Make a graph of H versus r with . You may assume that r is no larger than 1.
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C: Use your graph in part B to determine for what value of r the person will reach 90% of adult height at age 15.
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D: Use the information you found in part C to make a logistic model of height versus age.
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Round your answers to two decimal places, if necessary.
What will be an ideal response?
Find the focus and directrix of the parabola.x2 + 20y = 0
A. F: (-5, 0); D: y = 5 B. F: (0, -5); D: y = -5 C. F: (0, -5); D: y = 5 D. F: (0, -5); D: x = 5
Graph the solution set of the system of inequalities or indicate that the system has no solution.x2 + y2 ? 81y - x2 > 0
A. 
B. 
C. 
D. 
Write the expression in standard form.
A. -1 B. 1 + 2i C. 1 - 81i D. 1 - 2i