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
4 digit palindromes must be of form abba, so being required that you use both numbers, you only have two: 1221 and 2112
Answer:
120
Step-by-step explanation:
20% of 600
= 120 girls
