Negative 3 plus negative 17 minus negative 13

-7

Step-by-step explanation:

(-3) + (-17) = (-20)

(-20) - (13) = (-7)

This is all because when adding a negative with a negative, it's like adding normally with positives but with a negative answer at the end. For example we would have (-3) + (-5). I would just add these normally (3 + 5)=8 and then add a negative at the end. Same sequence with subtracting.

the circumference of a circle is, 10.676 cm.

step-by-step explanation:

the formula for circumference of a circle is given by:

where

c is the circumference of a circle and

d is the diameter of a circle.

given: diameter(d) = 3.4 cm and use

substitute these values in [1] we get;

cm

therefore, the circumference of a circle is, 10.676 cm

look in attachments

step-by-step explanation:

a = (-2, 0)

b= (-4, 0)

c = (-5,2)

d = (-1,2)