Answer:
c)
Step-by-step explanation:
The definition of an observational study is: one where researchers observe the effect of a risk factor or an intervention but they do not try to change who is exposed to the factor.
In this particular example, the researchers administered a questionnaire to 391 twelve-year-old and concluded that the body mass index of the adolescents who had a supply of sugary snacks in their bedroom was significantly higher than that of the adolescents who did not have a supply of sugary snacks in their bedroom.
This is not an observational study because the researchers actually administered a questionnaire and analyzed the results. To be an observational study the individuals would have been observed without any intervention (the questionnaire could have had an effect on the adolescents changing their habits)
UMMMMMMMMMMMM, what grade are u in, thats HARD!!!!!
To find the area of a circle, use the following formula; A = πr^2
The radius of a circle is half the diameter.
So;
4.) 18/2 = 9
Radius = 9
(3.14)9^2
9(9) = 81(3.14)
254.34 is the area of figure #4.
5.) 12/2 = 6
A = (3.14)(6)^2
A = (3.14)(36)
113.04(2) Because there are two pizzas.
226.08
Number 4 gives the most amount of pizza. So, one 18 in. pizza.
Answer:
I can't get the thing to copy or put a picture down. But, I think the answer is C. I'm not good at math. But, Lemme know if I have that one wrong!
- Martiinez ;)
Answer:
Step-by-step explanation:
note :
( a + b )^3 = a^3 +b^3 +3 a²b +3b²a + b^3...(*)
the condition is : r = 1 and p=1
put : x= a and b = 1 in (*) you have :
(x + 1)^3 = x^3 +3x² +3x +1
the zeros is : x = - 1
bcause : x^3 +3x² +3x +1 = 0 .... (x + 1)^3 = 0 so : x = - 1
