Luca, a receptionist at a law firm, has already spent 15 minutes on the phone. He expects to spend 0.3 more minutes routing each phone call as it comes in. Luca estimates he will route
50 calls today. Based on that estimate, how much time in total should he expect to spend on
the phone?

A3cm×3cm\greend{3\,\text{cm} \times 3\,\text{cm}} 3cm×3cm start color greend, 3, space, c, m, times, 3, space, c, m, end color greend rectangle sits inside a circle with radius of 4cm\blued{4\,\text{cm}} 4cm start color blued, 4, space, c, m, end color blued . what is the area of the shaded region? round your final answer to the nearest hundredth.