Answer:
The correct answer is c.
Step-by-step explanation:
Solving a quadratic function, it is found that the ball has a height of 19 feet at t = 0.72 seconds and t = 1.22 seconds.
<h3>What is a quadratic function?</h3>
A quadratic function is given according to the following rule:
The solutions are:
In which:
In this problem, the function is:
h(t) = -16t² + 31t + 5
The height is of 19 feet when h(t) = 19, hence:
19 = -16t² + 31t + 5
16t² - 31t + 14 = 0.
Then:
More can be learned about quadratic functions at brainly.com/question/24737967
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Answer:
10$ per hour
Step-by-step explanation:
if she spended 120$ and had 180$ left, that means she had 300$ in the first place. of she works 30 hours, that means:
300 (the money she has)
÷ 30 ( her work hours )
When we divide this, the answer is ten. that is why she earns 10$ per hour
Can't type thta trignale thingie so subsitute with x
7*9=(7*10)-(7*x)
we can multipily what we know
7*9=7 times 9=63
7*10=7 times 10=70
now we have
63=70-(7*x)
add (7*x) to both sides
(7*x)+63=70
subtract 63 from boths ides
(7*x)=7
divide both sides by 7
x=1
the answe ris traignle is equal to 1