You are doing a survey of the average amount (in $) spent by students in purchasing textbooks per semester. Suppose, you had no information on the standard deviation of the amount spent. However, you do know that the range in the amount spent is about $240. You have set a 95% level of confidence and do not want to be wrong by more than $5 in your estimate. What is the most appropriate sample size

i'm assuming it's looking for the missing length, which should be 4cm

hope this !

walter needs to make at least 5 more cookies but no more than 40. 5 ≤ x ≤ 40

step-by-step explanation:

20 ≤ x + 15 ≤ 55

subtract 15 from all parts

20-15 ≤ x + 15-15 ≤ 55-15

5 ≤ x ≤ 40

this means how many more cookies he has to make

walter needs to make at least 5 more cookies, but no more than 40 cookies; 5 ≤ x ≤ 40

- (2, -7)

- lines r and s and lines t and u must be parallel