Who Invented the computer mouse?

In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?
72 x 9 - 14 + 2 = ?

_________ is an example of intrusive igneous rock.

Contact force is another name for _________.

At what rate of compound interest per annum will a sum of Rs 20000 become Rs 23328 in 2 years?

Select the antonym of

mere

A _______ is a collection of letters, digits, punctuation characters, and so on.

What is the value of cosec 120°