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Mathematics, 25.09.2019 19:30 gujaratif932

Carry out the following operations, and express the answer with the appropriate number of significant figures:
part a: 320.37-(61016.8/3.3)=?
part b: [(290..100x10^3)]x2.8932=?
part c: (0.0040x29000.0)+(2818x15)=?
part d: 868x[1253-(3.87x108)]=?
i calculated all of them and i want you guys to me check it.
pa: -1.6x10^3
pb: 8.364x10^6
pc: 4.2x10^4
pd: 7.24x10^5

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