Answer: -9
Step-by-step explanation: when you add unwhole numbers they move father into the negatives if its easier you can take away the - mark and add 7 + 2 which is nine then you put the sign back good luck love!
 
        
             
        
        
        
Answer:
A = 26 ft²
Step-by-step explanation:
To find the area of a circle, use the formula A = πr²
We know π = 3.14 and C = 18.
Use the circumference to find "r". C = 2πr
C = 2πr
18 = 2(3.14)r
18 = 6.28r
r = 18/6.28         Exact answer
r ≈ 2.866           Rounded to three decimal places
You can use either of the two bolded "r" values. I will use the rounded answer in the formula for area.
Substitute π = 3.14 and r = 2.866.
A = πr²
A = (3.14)(2.866)²                  Solve exponents first
A = 3.14(8.213956)                Multiply
A = 25.7918218...                  Unrounded answer
A ≈ 26                                   Rounded to nearest square foot
Add the units back in.
<h3>A = 26 ft²</h3>
 
        
             
        
        
        
9 chairs because 2 to 4 is equal to 1/2 and half of 18 chairs is 9
        
                    
             
        
        
        
Answer:
1817
Step-by-step explanation:
2000 - 175 = 1825 and 8 years of digging 1817
 
        
                    
             
        
        
        
Frank can build a fence in twice the time it would take Sandy. Working together, they can build it in 7 hours. How long will it take each of them to do it alone?
Answer
 
If Frank and Sandy can build the fence in 7 hours, they must be building 
1
7
 of the fence every hour.
Now, let the amount of time it takes Sandy be 
x
 hours so that Frank takes 
2
x
 hours. Sandy can build 
1
x
 of the fence every hour and Frank can build 
1
2
x
 of the fence every hour.
We now have the following equation to solve.
1
x
+
1
2
x
=
1
7
2
+
1
2
x
=
1
7
21
=
2
x
x
=
21
2
=
10.50
Thus, Sandy takes 
10.50
 hours and Frank takes 
21
 hours.