15-20 is -5. If you put 15 on a number line and go back twenty spaces you land on -5 hope this helps.
Answer:
It should be a rhombus :)
Answer: Radius = 1,250
Step-by-step explanation: The circumference of a circle equals the 2 x radius x π.
The formula to solve the radius is 2r x 3.14 = 7,850
Divide both sides by 3.14 = 2r = 2,500
Divide both sides by 2 = r = 1,250.
The radius = 1,250
