Answer:
225
Step-by-step explanation:
Using the basic components of summation ∑
∑n = 
n(n + 1) and ∑1 = n
Thus
∑ (2n - 1) ← for n = 1 to 15
= ∑2n - ∑1
= 2∑n - ∑1
= 2 ( n(n + 1)) - n
= n(n + 1) - n ← Evaluate for n = 15 ( the upper value )
= 15 × 16 - 15
= 240 - 15
= 225
1
-----------
5m -20
factor out a 5 in the denominator
1
-----------
5 (m -4)
Choice A
There's many different types of shapes and figures. This is called <em>rhombus</em>.
A rhombus is a type of quadrilateral, and always has 4 sides and 4 verticals.
Answer:615.44
Step-by-step explanation:
