1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Katyanochek1 [597]
3 years ago
9

The formula to find a certain number in an arithmetic sequence is an=a1+d(n−1) .

Mathematics
1 answer:
REY [17]3 years ago
7 0

Answer:

(an -a1)/d +1 = n

Step-by-step explanation:

Undo what is done to n, in reverse order. When evaluating this expression, you ...

  • subtract 1 from n
  • multiply the difference by d
  • add a1

When you undo these, you get ...

... an -a1 = d(n-1) . . . . . . subtract a1

... (an -a1)/d = n - 1 . . . . divide by d

... (an -a1)/d +1 = n . . . . add 1

_____

<em>Comment on answer list</em>

Please note the use of parentheses in the answer here. These identify that the difference (an -a1) is what is divided by d. None of the offered answers has these parentheses, nor are they typeset in a way that would indicate the intent to divide (an -a1) by d. As given, none of the offered answers is correct.

You might be interested in
Consider the reduction of the rectangle. A large rectangle has a length of 16.8 feet and width of 2.3 feet. A smaller rectangle
vodomira [7]

Answer:

0.6

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
Which our equivalent to -11/4
katrin [286]
-11 divided by 4 and -11/4
5 0
2 years ago
Two trains leave stations 360 miles apart at the same time and travel toward each other. One train travels at 70 miles per hour
cricket20 [7]
S=d/t     ⇒d=s*t
s=speed
d=distance
t=time

The first train :
d=x

x=70 miles/h*t                             ⇒   x=70t  (1)

The second train
d=360 miles - x

360 miles - x=80 miles/h*t          ⇒360-x=80t   ⇒ x=360-80t   (2)

therefore, with the equations (1) and (2) we have a systeme of equations:

x=70t
x=360-80t

we can solve this system of equations by equalization method.

70t=360-80t
70t+80t=360
150t=360
t=360/150=2.4     (≈2 hour  24 minutes)

Answer:  the first train meet with the second train in 2 hour 24 minutes. 


3 0
3 years ago
Read 2 more answers
8. The 1st student flipped a fair coin 7 times
REY [17]
My guess is he gets heads about half the time
4 0
3 years ago
Find the area of the parallelogram.<br> 6 cm<br> 7.5cm<br> 9cm
lisabon 2012 [21]

Answer: Find the area of the parallelogram. Answer is A=54

6 cm

7.5cm

9cm

Step-by-step explanation: get the base and the height and then multiply

4 0
3 years ago
Read 2 more answers
Other questions:
  • What is the value of the expression below 20 + 8 - 4 - 4
    5·1 answer
  • PLEASE HELP<br> I WILL GIVE YOU STARS!!!!!!!!!!!!!!!!!!!!!!!!111
    7·1 answer
  • In the diagram below, AB is parallel to CD . What is the value of y?
    10·1 answer
  • If 102y = 25, then 10-y equals:<br><br> (a) -1/5, (b) 1/625, (c) 1/50, (d) 1/25, (e) 1/5
    12·1 answer
  • On the coordinate plane shown, AB is a vertical segment with a length of 5 units. If A'B' is the image of AB after a rotation, w
    6·1 answer
  • ................<br> ...................
    9·1 answer
  • Find two numbers the quotient is between 75÷4
    10·1 answer
  • Y=-2x find Oder pairs
    14·1 answer
  • What is the 4 letter code?
    11·1 answer
  • PLEASE HELP ME
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!