Answer:
18 pencils
Step-by-step explanation:
she had 18 minus 5= 13 hope this helps
The given problem can be exemplified in the following diagram:
The perimeter of a figure is the sum of all of its sides, therefore, the perimeter of the figure is:

Adding the terms:

therefore, the perimeter is 54 feet.
Answer:
hope it will be helpful to you
Answer:
16, then it's
Step-by-step explanation:
(x-4)^2 = 5^2
Since this is a equilateral triangle all angles are equal to each other. All angles in a triangle always add up to 180 degrees.
So you would set up your equation like so
3(7x - 3) = 180
The 3 outside the parenthesis resembles the 3 angles.
You equal the equation to 180 since all the angles in a triangle = 180
So distribute the 3
21x - 9 = 180
Add 9 to both sides
21x = 189
Divide 21 on both sides
x = 9