Most alpine skiers and snowboarders do not use helmets. do helmets reduce the risk of head injuries? a study in norway compared skiers and snowboarders who suffered head injuries with a control group who were not injured. of 578 injured subjects, 96 had worn a helmet. of the 2992 in the control group, 656 wore helmets. state: is helmet use less common among skiers and snowboarders who have head injuries? follow the four‑step process to answer the questions about this study. (note that this is an observational study that compares injured and uninjured subjects. an experiment that assigned subjects to helmet and no‑helmet groups would be more convincing.)

-3

step-by-step explanation:

a drawing really does here:

so i draw the horizontal line y=2 and the vertical line x=-2 at this intersection i put b (this is where my right angle is going to be).   so point b is at (-2,2).   point a is 5 units long and is also on y=2 so this point has to be (3,2) or (-7,2) -doesn't matter i will go with (3,2).

now we know c is at (-2,y) we don't know the y yet bet we know that c is on x=-2.

we have the area of the triangle is .5bh=12.5

we know the base length is 5 (ab)

we have the height is (2-y) if you look at your

plug in

.5(5)(2-y)=12.5

solve for y to get the y-coordinate for c

2.5(2-y)=12.5

divide both sides by 2.5 giving:

2-y=5

now subtract 2 on both sides

-y=3

y=-3

grab rope, tie a loop-de-loop, put it around ur neck, now jump while its tied to a high place. now your shoes are cool.

step-by-step explanation:

(x+3)(x+7)

step-by-step explanation:

step-by-step explanation:

one of the most important purposes of surface treatment is to alter surface properties according to the requirement of specific applications. for example, hydrophobic coating has been utilized on windshield and eyeglasses. gold atom monolayer on substrate has become a popular surface bioconjugation strategy.