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DerekMoncoal
24.07.2019 •
Mathematics
At the city museum, child admission is $5.60 and adult admission is $9.20. on sunday, 145 tickets were sold for a total sales of $1020.80. how many child tickets were sold that day?
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Ответ:
number of adults (y) is 58
and this is the work ( it's a linear equation system)
hope you understand it
good luck
Ответ:
Answer
f(x) = (x + 2)² - 5
Explanation
f(x) = x² + 4x − 1
Let y = f(x)
y = x² + 4x − 1
y + 1 = x² + 4x
Make the right hand of the equation a perfect square by adding (b/2)² on both sides.
y + 1 + (4/2)² = x² + 4x + (4/2)²
y + 1 + 4 = x² + 4x + 2²
y + 5 = (x + 2)²
Subtracting 5 on both sides.
y + 5 - 5 = (x + 2)² - 5
y = (x + 2)² - 5
Now replace y with f(x)
f(x) = (x + 2)² - 5