308

a)
f\left(x\right)=2{,}1\cdot1{,}06^x
f\left(0\right)=2{,}1\cdot1{,}06^0=2{,}1
f\left(7\right)=2{,}1\cdot1{,}06^7=3{,}1756...\approx3{,}2
massa kasvaa 6% vuorokaudessa
b)
f\left(x\right)=2{,}6\cdot0{,}96^x
f\left(0\right)=2{,}6\cdot0{,}96^0=2{,}6
f\left(7\right)=2{,}6\cdot0{,}96^7=1{,}9537...\approx2{,}0g
massa vähenee 4% vuorokaudessa