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ic838847
10.10.2019 •
Mathematics
Me in number 9 i need the answer and the work
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Ответ:
For addition and subtraction, you need to have the same power to add or subtract.
For multiplication and division, you just need to add or subtract the power.
A. 8.6 × 3.2 = 27.52 and then with the powers so it's 10⁷
27.52 × 10⁷ is the same thing as 2.752 × 10⁸ so it cant be choice a
B. 1.870 x 10⁷ + 2.565 x 10⁸ you need the powers to be the same so the change one to make the other one the same so it would be 0.1870 x 10⁸ + 2.565 x 10⁸ which equals to 2.752 x 10⁸ so b cant be it either
C. 6.88 x 10¹¹ ÷ 2.5 x 10³ you just divide 6.88/2.5 = 2.752 and then subtract the exponents so it's 2.752 x 10⁸ c cant be it either
D. 7.887 x 10¹² -- 5.135 x 10⁴ that already doesn't look right because if you just subtract it directly, it's 2.752 and the two powers are completely off
The correct wrong answer is D
Hopes this helps!
Ответ: