The average of 4, 9, 16, 25 and x is 2x means that;
(4+9+16+25+x)/5=2x
Multiply both side by 5
5(54+x)/5=2x(5)
54+x=10x
Subtract x to both side
54+x-x=10x-x
54=9x
Divided 9 to both side
54/9=9x/9
x=6
Check:
Substitute x with 6
(4+9+16+25+x)/5=2x
(4+9+16+25+6)/5=2(6)
60/5=12
12=12; so x=6 which marks B as the correct answer. Have a nice day!
Answer:
For a monthly cost of at least $7 and at most $8, you can have between 100 and 110 calling minutes.
Step-by-step explanation:
The problem states that the monthly cost of a celular plan is modeled by the following function:

In which C(x) is the monthly cost and x is the number of calling minutes.
How many calling minutes are needed for a monthly cost of at least $7?
This can be solved by the following inequality:






For a monthly cost of at least $7, you need to have at least 100 calling minutes.
How many calling minutes are needed for a monthly cost of at most 8:






For a monthly cost of at most $8, you need to have at most 110 calling minutes.
For a monthly cost of at least $7 and at most $8, you can have between 100 and 110 calling minutes.
I believe the answer should be 6x+3
Answer:
Step-by-step explanation:
rate = a
a = -16-(-11)/9-6
a= -5/3
Answer:The amount to be paid within the discount period is $980
Step-by-step explanation:
The term 2/10, n45
means that 2% discount is offered if the amount of invoice is paid within 10 days from the date of invoice .
n/45 means that the buyer will pay the full amount within 45 days if he /she does not pay within the discount period of 10 days .
Now if the amount is to be paid within the discount period, the amount will be
Amount to be paid= $1000- 2% of 1000
= $1000-20
=$980