What are the zeros of the quadratic function f(x)=2x^2-10x-3

In a sale there is 25% of all prices a chair costs £45 in sale how much was it before the sale

Describe a situation where it would be beneficial to round decimals to the nearest dollar. explain why you would use rounding in that situation.

You’re ordering more thread for blue jeans co. you usually purchase from ted’s threads, which sells 12 thread spools for $27. you recently received a notice from wade's wares that says you can buy thread from them for $2.30 each for the first 2 dozen and $2 a spool thereafter. you need to order 5 dozen spools. what percentage can you save by going with wade’s wares?