Answer:
7 cm
Step-by-step explanation:
An equilateral triangle has all sides equal.
To find the measure of the side, simply divide the perimeter by 3. This is because a triangle has 3 sides.
21 ÷ 3 = 7
I think number #29 is A but may be B and number #30 is C
40+3+.04+.003
expanded form is showing what you have to add together
Put it in a decimal then divide