What is an algebraic expression for the height h increased by 6 inches

The height can be represented by the variable H
As algebraic expressions don't use words, 'inches' cannot be included in the expression. This can only be assumed. 

As a result, H+6 would be the algebraic expression equivalent of 'H increased by 6 inches'. 

A= r2 × 3.14 11×11 ↓ ↓ 121 × 3.14 = 379.94 → 379.9

2.) is the most sense