find the width of a rectangle with a perimeter of 90 and the length of 15
(1 point)
A. 90
B. 15
C. 45
D. 30
A. 90
To find the width of a rectangle, first, we need to understand the formula for the perimeter of a rectangle, which is P = 2 * (length + width).
In this case, we are given that the perimeter (P) is 90 and the length (L) is 15.
Plugging in the given values into the formula: 90 = 2 * (15 + width).
Now, we can solve for the width (W).
Divide both sides of the equation by 2 to isolate the quantity (length + width):
90 / 2 = 15 + width.
45 = 15 + width.
Subtract 15 from both sides of the equation:
45 - 15 = width.
30 = width.
Therefore, the width of the rectangle is 30.
Answer: D. 30.
To find the width of a rectangle with a perimeter of 90 and a length of 15, we can use the formula for the perimeter of a rectangle, which is:
Perimeter = 2(length + width)
Given that the perimeter is 90 and the length is 15, we can substitute these values into the formula:
90 = 2(15 + width)
Now, we can simplify and solve for the width:
90 = 30 + 2width
Subtracting 30 from both sides:
60 = 2width
Dividing both sides by 2:
30 = width
Therefore, the width of the rectangle is 30.
The correct answer is D. 30.