The variable t represents the number of seconds that have passed after the release of the rocket.
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Function</h3>
The function can be defined as an expression that defines a relationship between one variable (the independent variable) and another variable (the dependent variable).
The height of a rocket a given number of seconds after it is released is modeled by,

As given in the above function, h (height) is the dependent variable which depends on the number of seconds t after the rocket is released (independent variable).
Hence we can conclude that the variable t represents the number of seconds after the rocket has been released.
To know more about the function, follow the link given below.
brainly.com/question/5245372.
Answer:
21 cm by 21 cm
Step-by-step explanation:
The formula for the area of a square is A = x^2, where x is the length of any one side of the square. Here,
441 cm² = x²
This actually has two roots: {√441, -√441), but since x must be positive here, to be a dimension of the square, we choose +√441, or +21.
The dimensions of the square are 21 cm by 21 cm.
Answer:
the correct graph is pictured below
Step-by-step explanation:
the graph is below
It is a quadratic
where x-8 is the squared term
do
x-8=u
u^2-13u+30=0
solve
u=

u=

u=

u=

u=

u=

or u=

u=10 or 3
10=x-8 or 3=x-8
18=x or 11=x
x=11 and/or 18