Chemists measure the acidity of an aqueous solution using pH. The pH is 
where pH is a measure of the hydrogen ion concentration 
measured in moles of hydrogen per liter of a solution. Find the pH of a solution if 
= 
. Round your answer to one decimal place, if necessary.
a. 6.7
b. 5.2
c. 6.2
d. –6.7
c. 6.2
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Find the tax rate for the area. Round to the nearest tenth of a percent.Total tax needed: $13,210,000Total assessed value: $643,360,000
A. 48.7% B. 2.1% C. 4.9% D. 0.2%
Solve the problem. Round rates to the nearest tenth of a percent and dollar amounts to the nearest cent.What-A-Pane Inc. sells windows for $106.81 each after a markup of $34.69. Find (a) the cost of a window, (b) the markup as a percent of cost, and (c) the markup as a percent of selling price.
A. (a) $72.12 (b) 32.5% (c) 48.1% B. (a) $72.12 (b) 48.1% (c) 32.5% C. (a) $141.50 (b) 24.5% (c) 75.5% D. (a) $141.50 (b) 75.5% (c) 48.1%
Given: ?1 ??3
Proof: STATEMENTS REASONS
m?+m?2 = m?ABD _______________________
Write the imaginary number in terms of i.
A. -9
B. 9i
C. 9
D. -9i