Solve for X

Pls help if you can

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

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

1. how do you convert the repeating, nonterminating decimal 0. to a fraction? explain the process as you solve the problem.