The percentage increase of the value of Tessa's stock is 21%.
<h3>Percentage increase</h3>
Using this formula
Percentage increase=Current stock worth-Old stock worth/Old stock worth
Where:
Current stock worth=$297.66
Old stock worth=$246.00
Let plug in the formula
Percentage increase=$297.66 - $246.00 / 246.00 × 100
Percentage increase=$51.66/ 246.00 × 100
Percentage increase=21%
Inconclusion the percentage increase of the value of Tessa's stock is 21%.
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(1/9)^-2
=(9/1)^2
=81/1
=81
The number of stamps with penny in terms of x is 
<em><u>Solution:</u></em>
Given that,
Ryan has x stamps in his collection
Number of stamps of Ryan = x stamps
Let the stamps with penny be "a"
Ryan has 6 times as many stamps as penny
Therefore,
Number of stamps in Ryan = 6 times as many stamps as penny

Thus number of stamps with penny in terms of x is 
Answer:
they are equal
Step-by-step explanation:
f(x) means the same thing as y.