Question

Mark think of a number mark doubles it and add 2.9 to get answer of 30.6 form an equation with x from the information

Answer 1

2x + 2.9 = 30.6

Explanation:

We are to represent the unknown number that Mark thinks of with x

If Mark doubles this unknown number, he multiplies it by 2 and the unknown number becomes - 2x

He then adds 2.9

The equation becomes 2x + 2.9

The answer of the above equation is 30.6

This gives : 2x + 2.9 = 30.6