x = Total number of trees
x * 0.45 = 27
x = 27 / 0.45
x = 60
There are 60 trees in the park
Answer:
96.67 (rounded)
Step-by-step explanation:
If 5 is equal to 120 then make a ratio
5 over 120 and x over 2320
then cross multiply
so 5 x 2320 = 11600
then do 11600/120 = 96.6666666667
You can turn 5 into 10/2 and add to x/2
then you need to use simple algebra to left the x alone in the equation so you need to multiply both sides by 2 so you get
2y=10+x
then you need to subtract both sides a 10 so
2y-10=x
now change the x to f'(x) and y to x so:
f'(x)=2x-10
You move like terms to their side, so 20 would go with four but you have to change the sign. In the end it would be 5x-3x=4-20
you subtract 5x-3x which is 2x and 4-20 which is -16. From there you move 2x to the other side by dividing and it'll give you -8. X=-8
Answer:
We are 90% confident that the true proportion of teenagers who have used at least one informal element in school writing assignments is between 0.464 and 0.518
Step-by-step explanation:
We can begin finding the estimator for the proportion of interest:
The confidence level is 90% , and the significance level would be given by and . And the critical value would be given by:
The confidence interval for the mean is given by the following formula:
Replacing the info given we got:
We are 90% confident that the true proportion of teenagers who have used at least one informal element in school writing assignments is between 0.464 and 0.518