Find the missing side lengths. HELP PLEASEE.

For the equation below, x is the input and y is the output. y = -4x + 3 if the input is -8, then the output is

For one history test, keith had to answer 40 questions. of these 40 questions, keith answered 28 of them correctly. what percent did keith get on his history test? round your answer to the nearest tenth if necessary

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?