The r variable outside the parentheses can multiply both the numbers in the parentheses.
This called distributing the r. We are using the distributive property.
The distributive property states that a(b + c) = ab + ac.
r(18 - 3) = 18r - 3r
So, (r * 18) - (r * 3) is the answer.
SU would be the hypotenuse so you can use Pythagorean Theorem to solve this problem.
42^2 + 56^2 = c^2
1764 + 3136 = c^2
4900 = c^2
70 = c
No shes not.
You need to add all the sides if finding perimeter
