Solve the problem.A company predicts that sales will increase rapidly after a new product is released, with the number of units sold weekly modeled by N = 7000(0.2)0.5t, where t represents the number of weeks after the product is released. What is the expected upper limit on the number of units sold per week?
A. 8400 units
B. 7000 units
C. 9100 units
D. 1400 units
Answer: B
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Solve the problem by integration.Find the moment of inertia with respect to the y-axis of the first-quadrant area bounded by 
and the axes, where k is the mass per unit area.
A. 
B. 
C. k
D. 
Solve the problem.The distribution of weights of students at a high school has a mean of 143 lb, a median of 
and modes at 
and 
State whether you think the distribution of weights is normal, rectangular, 
or 
Explain your
answer. What will be an ideal response?
Solve for x. Assume that a and b represent positive real numbers.x2 - a2 - 81 = 0
A. {
, - 
}
B. {a2 + 81, a2 - 81}
C. {
, - 
}
D. {
, - 
}
Solve the problem.If the lengths of the sides of a square are tripled, by what factor will the area change?
A. 6 B. 27 C. 3 D. 9