Answer: $2,370
Step-by-step explanation:
If she increases her monthly payments by 10 each month, then the rate at which it is increasing is in arithmetic progression. The formula for determining the sum of n terms of an arithmetic sequence is expressed as
Sn = n/2[2a + (n - 1)d]
Where
n represents the number of terms in the arithmetic sequence.
d represents the common difference of the terms in the arithmetic sequence.
a represents the first term of the arithmetic sequence.
From the information given,
n = 18 months
a = $42.50
d = $10
Therefore, the sum of the first 18 terms, S18 would be
S18 = 18/2[2 × 42.5 + (18 - 1)10]
S18 = 9[85 + 170)
S18 = 9 × 255 = $2295
The amount that she paid for the refrigerator the end of the 18 months is
2295 + 75 = $2370
Answer:
Variable.
Step-by-step explanation:
A letter that takes the place of a number is called a variable.
B is in standard form
Step-by-step explanation: standard form is y=mx+b
Answer:
5
Step-by-step explanation:
24-8X=-16
24+16=8X
40=8X
X=5
Answer:
3 sides
180 degrees
Yes
False
60 degrees
Extending to the side or moving to the side
Rhombus, Square, Rectangle
Acute
Sides
Angles