A rectangle has a length of 6 cm and a width of 3 cm. Each side is doubled in length. What is the ratio of the areas of the two
2 answers:
Answer:
Ratio of the area = 4 : 1
Step-by-step explanation:
Given : A rectangle has a length of 6 cm and a width of 3 cm.Each side is doubled in length.
To find : What is the ratio of the areas of the two rectangles.
Solution : Length = 6 cm.
Width = 3 cm .
Area 1 = length * width .
Area = 6 * 3
Area 1 = 18 cm².
If the each side is double :
Length = 12 cm .
Width = 6 cm .
Area 2 = 12 * 6 .
Area 2 = 72 cm².
Ratio of the area = .
Ratio of the area = .
Ratio of the area = 4 : 1
Therefore, Ratio of the area = 4 : 1
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Answer:
The functions are inverses; f(g(x)) = x ⇒ answer D
⇒ answer D
Step-by-step explanation:
* <em>Lets explain how to find the inverse of a function</em>
- Let f(x) = y
- Exchange x and y
- Solve to find the new y
- The new y =
* <em>Lets use these steps to solve the problems</em>
∵
∵ f(x) = y
∴
- Exchange x and y
∴
- Square the two sides
∴ x² = y - 3
- Add 3 to both sides
∴ x² + 3 = y
- Change y by
∴
∵ g(x) = x² + 3
∴
∴ <u><em>The functions are inverses to each other</em></u>
* <em>Now lets find f(g(x))</em>
- To find f(g(x)) substitute x in f(x) by g(x)
∵
∵ g(x) = x² + 3
∴
∴ <u><em>f(g(x)) = x</em></u>
∴ The functions are inverses; f(g(x)) = x
* <em>Lets find the inverse of h(x)</em>
∵ h(x) = 3x² - 1 where x ≥ 0
- Let h(x) = y
∴ y = 3x² - 1
- Exchange x and y
∴ x = 3y² - 1
- Add 1 to both sides
∴ x + 1 = 3y²
- Divide both sides by 3
∴
- Take √ for both sides
∴ ±
∵ x ≥ 0
∴ We will chose the positive value of the square root
∴
- replace y by
∴