Question

2 + 1.25 f = 10 - 2.75​

Answer 1

$2 + 1.25f = 10 - 2.75 \\ \\ = > 2 + 1.25f = 7.25 \\ \\ = > 1.25f = 7.25 - 2 \\ \\ = > 1.25f = 5.25 \\ \\ = > f = \frac{5.25}{1.25} \\ \\ = 4.2$