Answer:
Independent Variable - Type of Phone
Dependent Variable -Type of Service
Step-by-step explanation:
Let's begin by listing out the information given to us:
There are four students: n = 4
Number of students to be selected: r = 2
To calculate the combination of 2 students to be chosen, we use:

Therefore, there 12 possible combinations from these
Answer:
Week and a day
Step-by-step explanation:
You have $30, you save $5 each week and your aunt gives you an extra $10. Equaling out to $15 per week. Since the bike costs $155.75, you subtract your $30, coming out to 125.75 then you divide it by 15 which is 8 days
Short Answer: Combine like terms
Remark
Just from what I see here, remove the brackets first and combine like terms second.
Discussion
8 - 2x + 4 The like therms are 8 and 4 First step
12 - 2x That's the answer. Don't go any further. 2nd and last step