Estimate the sum or difference by first rounding each value to the indicated place value. Then find the actual sum or difference.711.16 - 51.3
round each to the nearest ten
A. Estimate:660; Actual: 660.86
B. Estimate: 670; Actual: 669.86
C. Estimate: 670; Actual: 659.86
D. Estimate: 660; Actual: 659.86
Answer: D
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A. pH = 9; base B. pH = 3; acid C. pH = 7; neutral D. pH = 10; base
Solve the problem.Kara owns a hotdog stand. She has found that her profit is represented by the equation 
with P being the profit in dollars, and x the number of hotdogs sold. How many hotdogs must Kara sell to maximize her profit?
A. 29 hotdogs B. 49 hotdogs C. 24 hotdogs D. 30 hotdogs
Provide an appropriate response.Find the arc length intercepted on the circumference of a circle by a central angle of 6 radians if the radius of the circle is 2.8 m.
A. 8.8 m B. 16.8 m C. 2.14 m D. 12.48 m
Solve the problem.In 1838, the German mathematician and astronomer Friedrich Wilhelm Bessel was the first person to calculate the distance to a star other than the Sun. He accomplished this by first determining the parallax of the star, 61 Cygni, at 0.314 arc seconds (Parallax is the change in position of the star measured against background stars as Earth orbits the Sun. See illustration.) If the distance from Earth to the Sun is about 150,000,000 km and ? = 0.314 seconds = 
minutes = 
degreesdetermine the distance d from Earth to 61 Cygni using Bessel's
figures. 
What will be an ideal response?