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12. A gear with a radius of 2 centimeters is turning at radians/sec. What is the linear speed at a point on the outer edge of the gear? cm/sec cm/sec cm/sec 22π cm/sec 11. Strontium-90 decays at a constant rate of 2.44% per year. Therefore, the equation for the amount P of strontium-90 after t years is . How long will it take for 15 grams of strontium-90 to decay to 5 grams? Round answer to 2 decimal places. 450.25 years 4.50 years 40.50 years 45.03 years 13. A circle has a radius of 2 centimeters. Find the area of the sector of the circle formed by an angle of 30° - If necessary, round the answer to two decimal places. 0.33 sq. cm. 0.52 1.05 2.09 sq. cm.

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