What is 4 - 2 + 8 divided by 2

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Find the rate at which the water is now flowing from the tap give your answer cubic centimetres per second

The length of an intercepted arc of a central angle of a circle is 4 cm. if the radius of the circle is 5 cm what is the measurement of the central angle to the nearest whole degree