Step-by-step explanation:
1. 42m below the sea level.
2. you withdrawn 42 dollars from 100.
3. -14°C or -14°F or -14K.
4. your height increased from 242inches to 245 inches. your height increased by 3 inches !
hope this helps you.
Answer: x = 2
<u>Step-by-step explanation:</u>
![2^{2x}-2^x-12=0\\\\\text{Let u = }2^x\\\\u^2-u-12=0\\(u-4)(u+3)=0\\\\u-4=0\quad and\quad u+3=0\\u=4\qquad and\quad u=-3\\\\\text{Substitute u with }2^x\\2^x=4\qquad and \quad 2^x=-3\\2^x=2^2\quad and\quad \text{not possible}\\\boxed{x=2}](https://tex.z-dn.net/?f=2%5E%7B2x%7D-2%5Ex-12%3D0%5C%5C%5C%5C%5Ctext%7BLet%20u%20%3D%20%7D2%5Ex%5C%5C%5C%5Cu%5E2-u-12%3D0%5C%5C%28u-4%29%28u%2B3%29%3D0%5C%5C%5C%5Cu-4%3D0%5Cquad%20and%5Cquad%20u%2B3%3D0%5C%5Cu%3D4%5Cqquad%20and%5Cquad%20u%3D-3%5C%5C%5C%5C%5Ctext%7BSubstitute%20u%20with%20%7D2%5Ex%5C%5C2%5Ex%3D4%5Cqquad%20and%20%5Cquad%202%5Ex%3D-3%5C%5C2%5Ex%3D2%5E2%5Cquad%20and%5Cquad%20%5Ctext%7Bnot%20possible%7D%5C%5C%5Cboxed%7Bx%3D2%7D)
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Answer: x = 0
<u>Step-by-step explanation:</u>
![3^{2x}+3^{x+1}-4=0\\\\3^{2x}+3^x\cdot3^1-4=0\\\\\text{Let u = }3^x\\u^2+3u-4=0\\\\(u+4)(u-1)=0\\\\u+4=0\quad and\quad u-1=0\\u=-4\qquad and\quad u=1\\\\\text{Substitute u with }3^x\\3^x=-4\qquad and\quad 3^x=1\\\text{not possible}\ and\quad 3^x=3^0\\.\qquad \qquad \qquad \qquad \boxed{x=0}](https://tex.z-dn.net/?f=3%5E%7B2x%7D%2B3%5E%7Bx%2B1%7D-4%3D0%5C%5C%5C%5C3%5E%7B2x%7D%2B3%5Ex%5Ccdot3%5E1-4%3D0%5C%5C%5C%5C%5Ctext%7BLet%20u%20%3D%20%7D3%5Ex%5C%5Cu%5E2%2B3u-4%3D0%5C%5C%5C%5C%28u%2B4%29%28u-1%29%3D0%5C%5C%5C%5Cu%2B4%3D0%5Cquad%20and%5Cquad%20u-1%3D0%5C%5Cu%3D-4%5Cqquad%20and%5Cquad%20u%3D1%5C%5C%5C%5C%5Ctext%7BSubstitute%20u%20with%20%7D3%5Ex%5C%5C3%5Ex%3D-4%5Cqquad%20and%5Cquad%203%5Ex%3D1%5C%5C%5Ctext%7Bnot%20possible%7D%5C%20and%5Cquad%203%5Ex%3D3%5E0%5C%5C.%5Cqquad%20%5Cqquad%20%5Cqquad%20%5Cqquad%20%5Cboxed%7Bx%3D0%7D)
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Answer: No Solution
<u>Step-by-step explanation:</u>
![4^x+6\cdot 2^x+8=0\\\\2\cdot 2^x+6\cdot 2^x+8=0\\\\\text{Let u = }2^x\\2u+6u+8=0\\8u+8=0\\8u=-8\\u=-1\\\\\text{Substitute u with }2^x\\2^x=-1\\\text{not possible}](https://tex.z-dn.net/?f=4%5Ex%2B6%5Ccdot%202%5Ex%2B8%3D0%5C%5C%5C%5C2%5Ccdot%202%5Ex%2B6%5Ccdot%202%5Ex%2B8%3D0%5C%5C%5C%5C%5Ctext%7BLet%20u%20%3D%20%7D2%5Ex%5C%5C2u%2B6u%2B8%3D0%5C%5C8u%2B8%3D0%5C%5C8u%3D-8%5C%5Cu%3D-1%5C%5C%5C%5C%5Ctext%7BSubstitute%20u%20with%20%7D2%5Ex%5C%5C2%5Ex%3D-1%5C%5C%5Ctext%7Bnot%20possible%7D)
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Answer: No Solution
<u>Step-by-step explanation:</u>
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You can use the app photo math to get the answer it’s free, hope this helps!
1 x14=14 * what times one is one*
2 x7=14