Estimate the answer by rounding as indicated.Estimate by rounding to the nearest hundred.
A. 3032
B. 3000
C. 2900
D. 3030
Answer: C
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Find the indicated probability.The following table show the results of a clinical trial for an allergy drug. 
What is the probability that a randomly selected person was given a placebo or improved? Round your answer to the nearest thousandth when necessary.
A. 0.942 B. 0.69 C. 0.772 D. 0.17
Use the 68-95-99.7 rule to solve the problem.The amount of Jen's monthly phone bill is normally distributed with a mean of $80 and a standard deviation of $10. Fill in the blanks.68% of her phone bills are between $___ and $___.
A. 60, 100 B. 80, 90 C. 60, 80 D. 70, 90
Provide an appropriate response.If the vertex of the graph of a quadratic function lies in quadrant II and the graph is concave up, how many x-intercepts does the graph have?
A. 2 B. 1 C. 0 D. 3
Solve the equation.7 = s + 1
A. 6 B. -6 C. -8 D. 8