Question related to Traingle and Parallelogram. Please solve all C D and E

Find all the values of x that make 0.1x + 0.25(102 - x) < 17.10 true.

When george started his current job, his employer told him that at the end of the first year, he would receive two vacation days. after each year worked, his number of vacation days will double up to five work weeks (25days) of payed vacation. how many vacation days will he have in 4 years

Simplify the following expression 48^1/2