I need to solve this trinomial using the Quadratic equation. -5x^{2} -4x+1=0

My answer is -1 and \frac{1}{10} but it says that it's wrong can someone help?

1/2+1/6-3/4 simplify the given expression leaving the answer in improper fraction form.

Joe owns a fast-food restaurant and wants to know the average time it takes for customers to receive their orders. his restaurant serves about 500 customers a day. he timed 5 orders, and the order times he collected, given in minutes, are shown below. can the approximate order fulfillment time for all of the restaurant's customers be calculated from the given data? if so, calculate it. non-integer answers should be rounded to the nearest tenth. if no assumption can be made, type "0" in the box. the approximate order fulfillment time for all of the restaurant's customers is minutes.

Someone me and explain! will award brainliest!