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19.05.2020 •
Mathematics
If f(x) = x2, find the inverse of f.
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Ответ:
The inverse is ±sqrt(x)
Step-by-step explanation:
y = x^2
Exchange x and y
x = y^2
Solve for y
Take the square root of each side
±sqrt(x) = sqrt(y^2)
±sqrt(x) = y
The inverse is ±sqrt(x)
Ответ:
f = cost of fries
2b + 2f = 14, so
b + f = 7
We’ll solve for f in terms of b:
f = 7-b
Then substitute that in to our other equation (what Marty bought) to get a numerical value for b:
3b + 4f = 23
3b + 4(7-b) = 23
3b + 28 -4b = 23
-b = -5
b = 5
Then calculate f:
f = 7-b
f = 7-5 = 2
Burger $5
Fries $2
Please lmk if you have questions.