Answer:
1:6
Step-by-step explanation:
Given that there are 10 circles and 2 triangles, the total number of shapes is equal to 10+2.
10+2=12
Because there are 2 triangles, the ratio of triangles to total shapes is equal to 2:12.
However, this ratio can be simplified because both sides are multiples of 2. Divide both sides of the ratio by 2 to simplify the ratio.
2:12
1:6
Therefore, the simplest ratio of triangles to total shapes is 1:6.
I hope this helps!
Answer:
Where
and 
We are interested on this probability

And the best way to solve this problem is using the normal standard distribution and the z score given by:

If we apply this formula to our probability we got this:
And we can find this probability using the complement rule:

Step-by-step explanation:
Previous concepts
Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".
The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".
Solution to the problem
Let X the random variable that represent the variable of interest of a population, and for this case we know the distribution for X is given by:
Where
and 
We are interested on this probability

And the best way to solve this problem is using the normal standard distribution and the z score given by:

If we apply this formula to our probability we got this:
And we can find this probability using the complement rule:

??? Im lost in this question, could you be more specific?
1. $5.99/ 1 pound* 1.75 pound= $ 10.4825.
Rounded to the nearest cent, the answer is C. $10.48.
2. With <span>a = 2.4 , b = 0.237 , and c = 9.49:
c- 2ab
= 9.49 - 2* (2.4)* (0.237)
= 9.49 - 1.1376
= 8.3524
The answer is A. 8.3524.
3. 10/ (1 2/3)
= 10/ (5/3)
= 10* 3/ 5
= 6
The answer is B. 6.
Hope this would help~</span>