strodersage
23.11.2021 •
Mathematics
In a scaled diagram, 1 inch represents 20 feet.
How many square inches on the diagram
represent 1 square foot?
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Ответ:
240
Step-by-step explanation:
1 foot=12 inches.
12 inchest times 20=240
Ответ:
x(x+4) = 21, or x²+4x-21 = 0
Explination: The area of a rectangle is given by multiplying the length and width of the rectangle. We know that the length is 4 more than the width; if x represents the width, this means that the length is x+4.
The area would then be x(x+4). We know that the area equals 21; this gives us the equation
x(x+4) = 21
Using the distributive property, we have
x(x)+x(4) = 21
x²+4x = 21
To write in standard form, subtract 21 from each side:
x²+4x-21 = 21-21
x²+4x-21 = 0