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miltonC4191
22.02.2021 •
Mathematics
This question has two parts. First, answer Part A. Then, answer Part B.
Part A
Layla is selling pizzas to raise money for a school choir trip. She earns a profit of $6 for each pizza she sells. Let t represent the total profit earned for selling p pizzas.
On a separate piece of paper, write an explanation of how to graph the relationship. Then graph the relationship. Scan and upload your answer.
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Ответ:
a
Step-by-step explanation:
Ответ:
Step-by-step explanation:
Let w represent the width of the floor. Then the length of the floor is (w+4) and its area is ...
A = LW
525 = (w+4)(w)
w^2 +4w -525 = 0
(w -21)(w +25) = 0 . . . . factor the above
Solutions are ...
w = 21, w = -25
We are interested in the positive solution: w = 21.
The floor is 21 feet wide and 25 feet long.
Alternate solution
Sometimes, when the factors aren't obvious, it works well to write an equation for the average of the dimensions. Here, we can represent that with x, and use (x-2) for the width, and (x+2) for the length. Then we have ...
525 = (x-2)(x+2) = x^2 -4
529 = x^2
√529 = 23 = x
Then w=23 -2 = 21, and the length is w+4 = 25.