That would be the one and only 22
Answer:
The missing number is 4
Step-by-step explanation:
Given
21 x 39 x _____ x 19 divided by 12 = 5187
Required
Fill in the gap
Let the missing number be represented with y; So, the expression becomes
![\frac{21 * 39 * y * 19 }{12} = 5187](https://tex.z-dn.net/?f=%5Cfrac%7B21%20%2A%2039%20%2A%20y%20%2A%2019%20%7D%7B12%7D%20%3D%205187)
Multiply both sides by 12
![12 * \frac{21 * 39 * y * 19 }{12} = 5187 * 12](https://tex.z-dn.net/?f=12%20%2A%20%5Cfrac%7B21%20%2A%2039%20%2A%20y%20%2A%2019%20%7D%7B12%7D%20%3D%205187%20%2A%2012)
![21 * 39 * y * 19 = 62244](https://tex.z-dn.net/?f=21%20%2A%2039%20%2A%20y%20%2A%2019%20%3D%2062244)
Rearrange the expression on the left hand side
![21 * 39 * 19 * y = 62244](https://tex.z-dn.net/?f=21%20%2A%2039%20%2A%2019%20%2A%20y%20%3D%2062244)
![15561 * y = 62244](https://tex.z-dn.net/?f=15561%20%2A%20y%20%3D%2062244)
Divide both sides by 15561
![\frac{15561 * y}{15561} = \frac{62244}{15561}](https://tex.z-dn.net/?f=%5Cfrac%7B15561%20%2A%20y%7D%7B15561%7D%20%3D%20%5Cfrac%7B62244%7D%7B15561%7D)
![y = \frac{62244}{15561}](https://tex.z-dn.net/?f=y%20%3D%20%5Cfrac%7B62244%7D%7B15561%7D)
![y = 4](https://tex.z-dn.net/?f=y%20%3D%204)
Hence, the missing number is 4
Answer:
Yes, she can.
Step-by-step explanation:
We have to find the surface area of the footrest and see if it greater than or less than 1 square yard.
The surface area of a rectangular prism is given as:
A=2(wl+hl+hw)
where w = width, l = length, h = height
The footrest is 15 inches by 7 inches by 9 inches. Its surface area is:
A = 2[(7 * 15) + (9 * 15) + (9 * 7)]
A = 2[105 + 135 + 63]
A = 2 * 303 = 606 square inches
1 square inch = 0.000771605 square yards
=> 606 square inches = 606 * 0.000771605 = 0.468 square yards
Since the surface area of the prism is less than 1 square yard, she can completely cover the footrest with the fabric.
Answer:
The estimate is going to be about 9.9