Express the sum using summation notation. Use 1 as the lower limit of summation and i for the index of summation.a + ar + ar2 + . . . + ar11
A. 
B. 
C. 
D. 
Answer: D
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Solve the problem.Anne and Nancy use a metal alloy that is 20% copper to make jewelry. How many ounces of a 14% alloy and a 24% alloy must be mixed to form 100 ounces of the desired alloy?
A. 40 at 14% and 60 at 24% B. 70 at 14% and 30 at 24% C. 30 at 14% and 70 at 24% D. 60 at 14% and 40 at 24%
List the intercepts of the graph.Tell whether the graph is symmetric with respect to the x-axis, y-axis, origin, or none of these. 
A. intercepts: (6, 0) and (-6, 0 symmetric with respect to y-axis B. intercepts: (6, 0) and (-6, 0) symmetric with respect to x-axis, y-axis, and origin C. intercepts: (0, 6) and (0, -6) symmetric with respect to x-axis, y-axis, and origin D. intercepts: (0, 6) and (0, -6) symmetric with respect to origin
Solve the problem.In chemistry, the pH of a substance is defined by 
where 
is the hydrogen ion concentration in moles per liter. Find the 
of a sample of lake water whose 
is 3.05 × 10-9 moles per liter. (Round to the nearest tenth.)
A. 10.1 B. 8.5 C. 6.4 D. 7.3
Translate the sentence into an equation. Use x to represent the unknown number. Do not solve.If 6 is increased by a number, the result is three-fourths of the number.
A. 6x = 
+ x
B. 6 + x = 
x
C. 6 + x = 
+ x
D. 6x = 
x