why do we care about concussions and why is important to known the effects obout it​

please i need HELP x+y=15 , x-y=3 and How many square floor tiles of side 1/2m are needed to cover the school hall, excluding the room, shown in the diagram below. Please show ALL working. Which expression is equivalent to -3(1 - y) ?0-31 - 3y0-32 + 3y0-32 - 40 -3.2 + y PLEASE HELPPPP! 50 points, my brain has been doing homework all night and this is simple math ;-; I just cant think rn its 7th grade math. Thanks a million!Jamal reads every day. He read 55 pages on Tuesday, which is 25% less than what he read on Monday. How many total pages did Jamal read on Monday and Tuesday? Write solution as a mixed number. Pension data for David Emerson Enterprises include the following:_______. ($ in millions) Discount rate, 12% Projected benefit obligation, January 1 $ 350 Projected benefit obligation, December 31 485 Accumulated benefit obligation, January 1 320 Accumulated benefit obligation, December 31 435 Cash contributions to pension fund, December 31 170 Benefit payments to retirees, December 31 58 Required: Assuming no change in actuarial assumptions and estimates, determine the service cost component of pension expense for the year ended December 31.Service cost million HELLOOOOOooOOOoOooOOHELP MEEEEEEEEEEEEE The measure of central angle RST is r radians. What is the area of the shaded sector? A. 41 units^2B. 8 units^2 C. 16 units^2 D. 20 units^2 Which food handler should be excluded from coming to work? I need help with my biology hm Which of the following choices represents two consumers?A grass and grasshopperB.rabbit and dogC. mushroom and frogD.turtle and flower I need help ASAP Each letter of the word algebra is written on identical slips of paper and placed in a box of a slip of paper selected from the box without looking what is the probability that the slip of paper will not have the letter A on it. Some cells live for years, while others live for only a few days. Why do some cells get replaced faster than others? A normal six-sided die is thrown once. The number of outcomes in the sample space is Read the following excerpt from a narrative about a dishwashers first day working in a professional kitchen: Alfred stood at the dishwasher, the steam blasting his hair and leaving it lank and plastered to his neck. He needed this job. He would do anything to keep it. He was an experienced dishwasher. He knew hed be able to impress his boss, if shed just give him the chance. When shed asked him to stay an extra couple hours, Alfred hadnt had to think about it. Hed just said, _________. If the author of the narrative wanted to keep developing the main character, which line of dialogue would BEST finish the scene? Why? A. Excuse me, Mrs. Wilkes; it shows that Alfred is polite. B. Until 2 AM?; it provides a detail about how late Alfred will have to stay at work. C. Ill stay as late as you need me to, Mrs. Wilkes; it gives Alfred a chance to declare his commitment to the job. D. Is this the button you press to restart the dishwasher?; it provides an important detail about the work of being a dishwasher. You are using the equation 4(p 7) = 44 to determine how many pictures can be saved at one time to the photo stream on your cell phone. Describe the operations in the order that you will perform them to solve the equation. (3 points) in klm the measure of m=90 the measure of l=68 and mk=2.5 feet. find the length of kl to the nearest tenth of a foot 108.2 explain with answer How many solutions does x2 - 2x + 9 = 0 have and what type are they? Do NOT find theactual solutions. please help if you can. add any missing commas. Can someone help me with this problem number 4