If you burn 300 calories while exercising for 12 minutes, how many calories will you burn for exercising for 30 mins

750

Step-by-step explanation:

300/12 to show how many calories burnt by minute

which is 25

then multiplying 25 by 30 which is 750

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