Answer:
-8 + x ≥ 9
Step-by-step explanation:
Let's look at your sentence:
The <u>sum of -8 and a number</u> is <u>at least 9 </u>what is the equation look like
Sum is the result of adding
At least 9 means that the number is 9 or greater.
So what you have here is an inequality expression:
Sum of -8 and a number
-8 + x
x here is the "number" since we do not know the value we will use "x" to represent that number.
At least 9
At least means that it is equal or greater, so we use this expression ≥
and so we use put that all together
-8 + x ≥ 9
Answer:
The watered area is approximately 3783 square feet.
Step-by-step explanation:
The area that is watered due to the rotation of the spankler is a circular section area (
), whose formula is:
![A = \frac{\theta }{2}\times \frac{1}{360^{\circ}}\times 2\pi \times d^{2}](https://tex.z-dn.net/?f=A%20%3D%20%5Cfrac%7B%5Ctheta%20%7D%7B2%7D%5Ctimes%20%5Cfrac%7B1%7D%7B360%5E%7B%5Ccirc%7D%7D%5Ctimes%202%5Cpi%20%5Ctimes%20d%5E%7B2%7D)
Where:
- Water distance, measured in feet.
- Rotation angle, measured in sexagesimal degrees.
Given that
and
, the watered area is:
![A = \frac{60^{\circ}}{2} \times \frac{1}{360^{\circ}}\times 2\pi \times (85\,ft)^{2}](https://tex.z-dn.net/?f=A%20%3D%20%5Cfrac%7B60%5E%7B%5Ccirc%7D%7D%7B2%7D%20%5Ctimes%20%5Cfrac%7B1%7D%7B360%5E%7B%5Ccirc%7D%7D%5Ctimes%202%5Cpi%20%5Ctimes%20%2885%5C%2Cft%29%5E%7B2%7D)
![A \approx 3783\,ft^{2}](https://tex.z-dn.net/?f=A%20%5Capprox%203783%5C%2Cft%5E%7B2%7D)
The watered area is approximately 3783 square feet.
Answer:
U = 42
Step-by-step explanation:
70/100 = U/60
U = 42