For your last birthday, your parents gave you a used car for which they paid the fair market value of $10,000. while you are happy with the car, you were hoping for a sportier model that sells for $18,000. the opportunity cost to you of keeping the car that your parents gave you is:

Sleep paralysis. so this is something i’ve dealt with for most of my life (i’m 15) and i’m pretty sure my first sp was when i was 9. and it’s usually the usual i’m not able to move anything except for my eyes, and it’s so hard to breathe (feels like someone’s pushing hard on my chest) and then i hear someone whispering and then i can move and then have to essentially wake up because i won’t be able to go back to sleep. but recently. and i mean it’s happened twice now and it’s not even been a week. where i suddenly wake up like a noise woke me, but then soon realize i’m not able to move and i sleep on my side that doesn’t face the wall and i have a desk that is on the same wall as my bed but farther off in the room. and i see myself sitting in the computer chair. like me. but as soon as i see (myself) it spins around and faces me and just stares at me for a good 2-3 minutes. and then it is that i realize that it’s got cold eyes instead of my normal eyes. and for one it’s absolutely creepy to be able to see yourself move without you ya know and secondly i kinda feel threatened to be honest. it’s happened 2 times now and i noticed the 2nd time (me) stared at my paralyzed body for about a minute longer then the 1st time. i just wonder if anyone else experienced anything like this because i’ve never had this happen before. and i’ve told my close family and they just shrugged it off and said i’m just having bad dreams again, but my computer chair is facing my bed when i come back into my room? and i know usually these are hallucinations but nothing’s changed in my life to cause a sudden anxiety or stress spell so i don’t know. and i know what bad dreams feel like and sp is waay worse then a bad dream. you can’t be awake to be having a bad dream

[120 total points] (public health) in one of the largest human experiments ever conducted, in 1954 a randomized controlled trial was run to see whether a vaccine developed by a doctor named jonas salk was effective in preventing paralytic polio. a total of 401,974 children (ages 6–9), chosen to be representative of those who might be susceptible to the disease, were randomized to two groups: 200,745 children (the control group c) were injected with a harmless saline solution (a placebo) and the other 201,229 children (the treatment group t) were injected with salk’s vaccine.what was the point of giving saline solution to the children who didn’t get the vaccine? explain briefly.

What kind of wound occurs the skin scrapes against a hard surface and tiny blood vessels break in the outer layer of the skin