Answer:
5c + 1.3d - 6.3
Step-by-step explanation:

Hope this helps.
The answer is 9.42 for the ones wondernig what it was! I calculated it and took the exam and it was correct.
Answer:
g=12
Step-by-step explanation:
3 + g = 15
g = 15-3
g = 12
The equation given in the question has one unknown variable and so the value of k can definitely be found.
4/9(k + 4/7) = 3 1/3
4/9[(7k + 4)] = 10/3
4/(63k + 36) = 10/3
4 * 3 = 10 * (63k + 36)
12 = 630k + 360
12 - 360 = 630k
- 348 = 630k
Reversing both sides we get
630k = - 348
k = - 348/630
= - 174/315
= - 58/105
So the value of K comes out to be - 58/105 and it is not possible to simplify it further.
Answer:
C) H0:μd=0 and Ha:μd≠
0
Null hypothesis:
Alternative hypothesis: 
Step-by-step explanation:
A paired t-test is used to compare two population means where you have two samples in which observations in one sample can be paired with observations in the other sample. For example if we have Before-and-after observations (This problem) we can use it.
Let put some notation
x=value for the first shop , y = value for the second shop
The system of hypothesis for this case are:
Null hypothesis:
Alternative hypothesis: 
Or equivalently :
Null hypothesis:
Alternative hypothesis: 
Since we define the difference
and we obtain this:
The second step is calculate the mean difference
The third step would be calculate the standard deviation for the differences, and we got:
The 4 step is calculate the statistic given by :
The next step is calculate the degrees of freedom given by:
Now we can calculate the p value, since we have a two tailed test the p value is given by:
C) H0:μd=0 and Ha:μd≠
0