If the radius of a sphere is multiplied by 10, what is the effect on its volume?

C

Explanation:10^3=1,000. 100^3=1,000,000. 1,000,000/1,000=1,000. Therefore the volume is multipled by 1,000. This is the best way I can explain it.

the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.