9. estimate 19.73 + 6.78 by rounding before you add or subtract.

i think asking google will you get the answer to that question

no idea

step-by-step explanation:

you just switch the numbers basically so it would be 3/17

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