The area would be 441 m².
We first find the length of the given rectangle. We know area is length times width, that the area is 405 and the width is 15; this gives us:
405 = 15L
Divide both sides by 15:
405/15 = 15L/15
27 = L
Calculate the perimeter of the rectangle:
P = 2L + 2w = 2(27) + 2(15) = 84 m
The side of the square is 1/4 the perimeter of the rectangle we just found:
1/4(84) = 21 m
The area of a square is equal to its side length squared:
A = s² = 21² = 441 m²
Answer:
D - Add the parenthesis: (8+2)
Step-by-step explanation:
The Rules of Ordering in Mathematics - BODMAS
Brackets (parts of a calculation inside brackets always come first).
Orders (numbers involving powers or square roots).
Division.
Multiplication.
Addition.
Subtraction.
Source: https://mathworld.wolfram.com/Parenthesis.html
The answer is C. (70).
The easiest way to explain this is to use a table. You could you other methods like by using a proportion but this way is easier.
2. $350
3a: 15 is half of 30, so knowing that means the answer is 50%
3b. 3 is 1/4 of 12 because 3x4 is 12, meaning that 3 is 25% of 12.
3c. 6 over 10 as a decimal is 0.6. Which as a percent is 60%
4. Noah's method does work because 20% x 5 is equal to 100% of a number.