Answer:
term 25
Step-by-step explanation:
a is the number added from 3 to 8 is 5(must be constant like 8 to 13 is also 5
b is the zero term so 3-a which is 3-5=-2
 
        
             
        
        
        
If the weight of the little brother is x, then the weight of  Charles is x + 9
The equation that can be used to determine what each one weighs is:
x + (x + 9) = 99.
Let us now solve it. 
x + x +9 = 99
2x + 9 = 99
2x = 99 - 9
2x = 90
x = 90/2 
x = 45 
Little brother's  weight is 45 kg.
Charles'   weight  will be 45 + 9 =  54 kg 
Adding these two weights will give 99kg
 
 
        
                    
             
        
        
        
The standard form: Ax + By = C
3x - y = -6  YES - A = 3, B = -1, C = -6
3x + y = 6   YES - A = 3, B = 1, C = 6
x + 6y = 9   YES - A = 1, B = 6, C = 9
x - 6y = -9   YES - A = 1, B = -6, C = -9
 
        
             
        
        
        
Answer:
125.141
Step-by-step explanation:
Assuming that this is an equilateral triangle, I am going to divide this triangle in half to get a right triangle.
17 is our hypotenuse
17/2 = 8.5, this is one of our legs
The other leg is our height, which we will find.
We use Pythagoras Theorem to find the height/leg: 

 = 14.72243186
 = 14.72243186
Now, we use another formula to find the area of the triangle: 
14.72243186 × 17 = 250.2813416
250.2813416 ÷ 2 = <u>125.1406708</u>
 
        
             
        
        
        
You are adding s^2 to your 128 ft^2.  s^2 is a common representation of a square.  So you could think of it as adding an area of a square of side "s" to your deck.
So one way of drawing it is to draw a rectangle with area 128 ft^2 and attaching a square to one of its side.  The square that is attached has a side lenght of "s."