Answer:

Step-by-step explanation:
Given that the total area of Frame and Painting is 45 Sq Fts.
Dimensions of painting are 6 feet and 7 feet. Hence.
Let us assume the uniform thickness of frame is x
Hence the Length of frame with painting = 7+2x
and breadth = 6+2x
Area of the frame = length * breadth

Hence option b is correct.
Answer would be C.
Why A would be incorrect: 100m^2 is 100m × 100 m. That would be as big as a football field.
Why B would be incorrect: 1cm^2 is 1cm × 1cm. You can use a regular 15 cm to measure a piece of paper with the length of 1cm each side.
Why C would be correct: 1m^2 = 1m × 1m and it is also equals to 60cm × 60 cm. A 1 meter ruler = 60 cm = 4 times of your average 15 cm ruler. So, it is reasonable that a classroom is 10m by 10m in length and breadth.
Why D would be incorrect: The same explanation applies to here as well. Things that can be measured with 1m × 1m is a square table so your classroom can't be that small to fit an average of 30 to 40 students in there.
I hope my explanations were detailed and easy to understand. :)
The answer would be x=2 so 2
The value of "x" is 10
<em><u>Solution:</u></em>
Given that, we have to find the missing proportion
<em><u>The given proportion is:</u></em>

We can solve the above proportion by cross multiplying
Multiply the numerator of the first fraction by the denominator of the second fraction
Multiply the numerator of the second fraction by the denominator of the first fraction
Solve for variable "x"

Thus the missing number is 10
The phrase "less than" indicates subtraction, so to express 7 <em>less than </em>x, write X - 7.