Solve the problem.A = ?r2, where r is the radius, in centimeters. By approximately how much does the area of a circle decrease when the radius is decreased from 2.0 cm to 1.9 cm? (Use 3.14 for ?.)
A. 1.1 cm2
B. 1.5 cm2
C. 0.6 cm2
D. 1.3 cm2
Answer: D
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Use a z-Table to determine the percent of data specified. Round to the nearest hundredth.Greater than z = -0.07
A. 75.80% B. 24.20% C. 52.79% D. 47.21%
Find an equation for the circle.Center at (0, 1), radius 3
A. x2 + (y + 1)2 = 3 B. (x - 1)2 + y2 = 9 C. x2 + (y - 1)2 = 9 D. (x + 1)2 + y2 = 9
Solve the problem.A radio station emits a signal that can be received within a 30 mile radius of the station's location. Another radio station located 70 miles east emits a signal that can be received within a 60 mile radius of the station's location. The system of inequalities x2 + y2 ? 900 (x - 70)2 + y2 ? 3600can be used to determine the region in which both radio station signals can be received. Graph this system. 
A. 
B. 
C. 
D. 
Simplify the expression.(-7)3
A. 21 B. -343 C. -21 D. 343