What is the smallest number by which 84 must be multiplied to make it a perfect square ​

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

Is experimental probibilty the same as the observed frequency in math? i need the answer asap!

Acompound inequality is graphed, and its graph consists of all real numbers. which open scentence could have resulted in this solution set r> 3 or r< -2. r< 3 or r< -2. r> 3 or r> -2. r< 3 or r> -2 plz asap