Calculate the expressions and give the answers to three significant figures when [[$ a = \text{0.7}, b=\text{6.2}$]] and [[$ c = -\text{0.02}$]].

a) [[$ 2a^7 =$]]

b) [[$ (abc)^3 =$]]

c) [[$ \left(a+\dfrac{c}{b}\right)^{10} =$]]