In the figure shown, AC ? CE, BD ? BE and AE ? DE. If ?AED = 105°, find the measures of ?AEC and ?CAB.
?AEC = 67.5°, ?CAB = 30°
Mathematics
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Determine whether a set is infinite or finite.The set of candy bars sold in a month at a local convenience store
A. Finite B. Infinite
Mathematics
Determine the area of the shaded region in the figure. Use 3.14 for ? if necessary. 
A. 64 sq. cm B. 13.76 sq. cm C. 50.24 sq. cm D. 16 sq. cm
Mathematics
Find all saddle points for the matrix game.
A. Entry a12 B. Entry a12 and entry a21 C. Entry a21 D. No saddle points
Mathematics
Solve the problem.The hydrogen potential, pH, of a substance is defined by pH = -log [H+], where [H+] is measured in moles per liter. Find the pH of a sample of lake water whose [H+] is 3.05 × 10-9 moles per liter. (Round to the nearest tenth.)
A. 10.1 B. 7.3 C. 6.4 D. 8.5
Mathematics