The chemical acidity of a solution is measured in units of pH: 
where 
is the hydrogen ion concentration in the solution. If a sample of rain has a pH of 3.2, how many times higher is its 
than pure water's, which has a pH of 7?
a. 
b. 
c. 
d. 
e. 7
d.
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Solve the problem.An arch for a bridge over a highway is in the form of a semi-ellipse. The top of the arch is 35 feet above ground. What should the span of the bridge be, rounded to the nearest hundredth of a foot, if the height 30 feet from the center is to be 16 feet above ground?
A. 131.25 ft B. 33.73 ft C. 67.46 ft D. 62.13 ft
Determine whether the graph of the equation is symmetric with respect to the x-axis, the y-axis, and/or the origin.y = x + 1
A. origin B. y-axis C. x-axis D. x-axis, y-axis, origin E. none
Find the product.
A. 130.24 B. 23.4 C. 131.23 D. 130.13
A right circular cone has a diameter for its base of length 16 inches and an altitude of 15 inches. Use 
to find the exact lateral area of the cone.
A. 
B. 
C. 
D. None of These