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3 years ago

Find the product of (3x + 7y)(3x - 7y). (2 points) PLEASE I NEED THIS NOW

Mathematics

2 answers:

Murljashka [212]3 years ago

4 0

9x^2 - 49y^2

Best luck with your studying

Evgesh-ka [11]3 years ago

4 0

Answer:

(3x +7y)(3x-7y)

3²x²-21xy+21xy-7²x²

3²x²-7²y²

9x²-49y²

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Morgarella [4.7K]

$\text{mass of freight train} = 9.98 \times {10}^{6} kg$

$\text{mass of aircraft carrier} = 7.3 \times {10}^{7} \: kg$

$\text{difference of masses of aircraft and train: } \\ \\ 7.3 \times {10}^{7} - 9.98 \times {10}^{6} \\ \\ = 73 \times {10}^{6} - 9.98 \times {10}^{6}$

$= (73 - 9.98 )\times {10}^{6} \\ \\ = 63.02 \times {10}^{6} \\ \\ = 6.302 \times {10}^{6} \: kg \\ \\ \approx 6.3 \times {10}^{6} \: kg$

Approximately, aircraft carrier is 6.3 × 10^6 kg heavier than the freight train.

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