Answer:
Between 1 and 3 seconds
Step-by-step explanation:
There is no change in distance ( change in y ) between 1 and 3, so she wasn't walking during that time
 
        
                    
             
        
        
        
Step-by-step explanation:
Part A:
Let  be the number of mittens and
 be the number of mittens and  be the number of scarves. Then we have the inequalities:
 be the number of scarves. Then we have the inequalities: 
 <em>This says Nivyana and Ana cannot make more than 30 scarves</em>
 <em>This says Nivyana and Ana cannot make more than 30 scarves</em>
 <em>This says that</em> <em>Nivyana and Ana have to earn at least $1000.</em>
 <em>This says that</em> <em>Nivyana and Ana have to earn at least $1000.</em>
Part B: 
The graph is attached.
Notice that the graphs of the inequalities are solid lines, this just means that the points on these lines included to the solutions of each inequality.
The darker shaded region and the solid lines bounding it, are the solutions to the inequalities because that's where the values common to both inequalities are found.
Part C:
From the graph we get two possible solutions:
15 scarves & 10 mittens
25 scarves & 5 mittens.
These two points lie on the solid lines that bound the darker shaded region<em> (I picked those points to stress that the lines bounding the dark region are also solutions.)</em>
 
        
             
        
        
        
Answer:
No, it is not a right triangle.
Step-by-step explanation:
The simplest way to determine is testing out the numbers with Pythagorian theorem. 
If it complies with the theorem, it is a right triangle.
let's assume c = 28, b = 21, and a = 20
the longest side is the hypotenuse so side c (28 in) will be the hypotenuse.
According to the Pythagorian theorem, the square of the length of hypotenuse must equal to the sum of squares of other two sides.
check:
c^2 = 28^2 = 784
a^2 + b^2 = 21^2 + 20^2 = 841
because c^2 is not equal to a^2 + b^2, the triangle is not a right triangle.
 
        
             
        
        
        
Answer:
I think its c but im not sure