Answer:
-10
Step-by-step explanation:
Answer:
![\large\boxed{12.25=\dfrac{49}{4}}](https://tex.z-dn.net/?f=%5Clarge%5Cboxed%7B12.25%3D%5Cdfrac%7B49%7D%7B4%7D%7D)
Step-by-step explanation:
![12.\underbrace{25}_{2}=\dfrac{1225}{1\underbrace{00}_2}=\dfrac{1225:25}{100:25}=\dfrac{49}{4}\\\\12.25=12+0.25=12+\dfrac{25}{100}=12+\dfrac{25:25}{100:25}=12+\dfrac{1}{4}\\\\=\dfrac{12\cdot4}{4}+\dfrac{1}{4}=\dfrac{48+1}{4}=\dfrac{49}{4}](https://tex.z-dn.net/?f=12.%5Cunderbrace%7B25%7D_%7B2%7D%3D%5Cdfrac%7B1225%7D%7B1%5Cunderbrace%7B00%7D_2%7D%3D%5Cdfrac%7B1225%3A25%7D%7B100%3A25%7D%3D%5Cdfrac%7B49%7D%7B4%7D%5C%5C%5C%5C12.25%3D12%2B0.25%3D12%2B%5Cdfrac%7B25%7D%7B100%7D%3D12%2B%5Cdfrac%7B25%3A25%7D%7B100%3A25%7D%3D12%2B%5Cdfrac%7B1%7D%7B4%7D%5C%5C%5C%5C%3D%5Cdfrac%7B12%5Ccdot4%7D%7B4%7D%2B%5Cdfrac%7B1%7D%7B4%7D%3D%5Cdfrac%7B48%2B1%7D%7B4%7D%3D%5Cdfrac%7B49%7D%7B4%7D)
Answer:
20. 300π m³
21. 457 1/3 π cm³
Step-by-step explanation:
20. r = 10 ÷ 2 = 5
V = 5² × 12 × π = 25 × 12π=300π m³
21. r = 14 ÷ 2 = 7
![V = \frac{4}{3} \pi 7x^{3}](https://tex.z-dn.net/?f=V%20%3D%20%5Cfrac%7B4%7D%7B3%7D%20%5Cpi%207x%5E%7B3%7D)
V = 457 1/3 π cm³
Answer:
it is a+b-6x
Step-by-step explanation:
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