If we do it algebraically, we get
x + y = 420
This is the simplest equation. You see now this is a linear pair in two variables. Thus, there will be infinitely many solutions.
E.g - 419 + 1 = 420
42 * 10 = 420
21 * 20 = 420
etc,....
30,60,90
45,45,90
Pretty much all angles that add up to be 180
Perimeter: P = 2L + 2W. In this problem L = W + 4 or W = L - 4. We want L, so let's eliminate W:
P = 2L + 2(L - 4) = 20 (all measurements in feet)
Simplifying,
2L + 2L - 8 = 20, or 4L = 28 ft. Thus, L = 7 ft.
The rectangle is 7 ft long.
Answer:
20 pieces of tape.
Step-by-step explanation:
Okay, so first you have to realize that 1/4 of a foot means there is 4 pieces in a foot. So at this point you need to say there is 5 groups of four because 4 pieces of tape in a foot. So 5 times 4 is 20 pieces of tape.
Answer: 
Step-by-step explanation:
Using Pythagoras theorem , since it is a right angled triangle ,
side 1 = 10cm
side 2 = x cm
side 3 = x cm
Pythagoras theorem states that the area of the square whose side is the hypotenuse is equal to the sum of the areas of the squares on the other two sides. That is
100 = 
divide through by 2 , we have
50 = 
find the square root of both sides
