2n+9+5n=30 combine like terms on left side
7n+9=30 subtract 9 from both sides
7n=21 divide both sides by 7
n=3
A square since all sides are equal and the angles aren't acute so it can't be a rhombus
Answer:
A, B, C
Step-by-step explanation:
An integer is a whole number (so not a fraction)
Answer:
The answer is B. 
Step-by-step explanation:
Because 
So the answer in this question is B.
Answer:
101.91
Step-by-step explanation: