10. Kristina is four-fifths as old as her sister. Kristina is 12 years old. Write a multiplication equation and solve the equation to determine her sister's age. 11. Keaton sold three-fourths as much as Jimmy during a fundraiser. Keaton sold 60 products, How many products did Jimmy sell?

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Ответ:

sbelgirl2000

22.05.2020

Mathematics

maximum area is 9 square units

Step-by-step explanation:

area equation is $f(x)= -(x-3)^{2} +9\\$

find the derivative of the area equation and equate to 0

$-((x-3)(x-3)) +9\\-(x^{2} -6x+9)+9\\-x^{2} +6x-9+9\\-x^{2} +6x\\ derivative=-2x+6$

take the derivative and equate to 0

$-2x+6=0\\2x=6\\x=3\\$

Use this x value to evaluate the function $f(x)= -(x-3)^{2} +9\\$

= -(3-3)^2 +9

=0+9

=9 square units (this is the maximum area)

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