22 more than four times a number is less than 82

Find and simplify the difference of the golden ratio and its multiplicative inverse

Solve for x -2.3(r - 1.2 ) = -9.66 enter you answer as decimal.

The jewelry store is having a sale. necklaces that were regularly priced at $23.50 are on sale for $18.80. what is the percentage of decrease in the price of necklaces?