A total of 146 minutes. One student's picture takes 3 minutes. Therefore, 42 x 3 = 126. The class picture takes 10 x 2 = 20. Adding these together gives you a total of 146.
Response:
Option B is correct
Step-by-step breakdown:

(One-tailed test at a significance level of 5%)
n = 16 and x̄ = 1.97
s = 0.1
Standard error of the mean = 
Difference in means = 
t statistic = Difference in means/se = -1.2
degrees of freedom = 16 - 1 = 15
p-value = 0.124375
(B) do not reject the null hypothesis since the test statistic (-1.2) is > the critical value (-1.7531).
Consequently, the equation determining the remaining number of rooms Martin has to clean after
hours can be represented as: 
, in which
indicates the overall number of rooms. Step-by-step explanation: It is given that Martin has 4 rooms left to clean and takes 7 hours for the task. The equation in standard form for the number of rooms remaining after x hours, y, is set up as follows: The remaining rooms
, indicates the quantity after
hours. The cleaning rate is established as follows: Considering Martin cleans 4 rooms in 7 hours, the rate at which he cleans is given by: Hence, the equation can be expressed as
(Answer)
.
Answer:
5.(345)=1,780/333
Step-by-step explanation:
5.(345) can be calculated as (5,345 - 5)/999 which simplifies to 5,340/999, resulting in 1,780/333