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
ANEK [815]
3 years ago
8

What is the sum of the geometric series in which a1 = −5, r = 3, and an = −405?

Mathematics
1 answer:
marysya [2.9K]3 years ago
3 0
An = a1 * r^(n-1)

-405 = -5*3^(n-1)

3^(n-1) = 81

3^4 = 81  so n-1 = 3  and n =  4

Sn  = S4  =  -5 (1 - 3^4)   / ( 1 - 3)   =  400 / -2 = -200 Answer
You might be interested in
Please help! Thank you :)
kherson [118]

Answer:

There are 6 stores that have more that 38 pairs of glasses

Step-by-step explanation:

There are 6 stores that have more that 38 pairs of glasses

41,42,43,43,45,47

6 0
3 years ago
A couple realizes a real estate financing of R $ 180,000.00, to be paid in 360 monthly installments, with an effective interest
Lilit [14]

Answer:

ANSWER: letter D

Step-by-step explanation:

In the tenth installment, the debit balance is, in reais, of

180000 - 9. 500 = 175500

The 1% interest on this amount results in:

1% . 175 500 = 1755

Thus, the tenth installment is, in reais, 500 + 1755 = 2255

8 0
3 years ago
In the school store, all markups are 25%. If the store paid $12 for a t-shirt, what is the selling price?
pashok25 [27]

Answer:

$15

Step-by-step explanation:

6 0
3 years ago
The motion of an object was recorded by measuring the velocity of the object in meters per second at various times, as shown in
Komok [63]

The equation BEST represents the relationship between velocity and time is y = 2.2x + 6.

According to the statement

we have given some data in the form of graph according to the velocity per time and we have to find the relationship between the velocity and time.

So, for this purpose,

we know that the best method show the relationship is a slope intercept form.

So,

The slope intercept form is a the equation of a straight line in the form y = mx + b where m is the slope of the line and b is its y-intercept.

And

Using the coordinate points on the plane (0, 6) and (10, 28)

now we Determine the slope

Slope = 28-6/10-0

Slope = 22/10

Slope = 2.2

And then Determine the y-intercept

6 = 2.2(0) + b

b = 6

And now we have to put in the general form of the slope intercept form which is y = mx + b

Then the equation become

y = 2.2x + 6

So, The equation BEST represents the relationship between velocity and time is y = 2.2x + 6.

Learn more about slope intercept form here

brainly.com/question/1884491

#SPJ1

8 0
2 years ago
the number of kilograms of water in human body varies directly as the mass of the body. a 96 kg of water. how many kilograms of
sattari [20]
90milgrams so add and subtract your answer
4 0
3 years ago
Other questions:
  • Which type of transformation is described (x,y) (x+2, y+3)
    15·1 answer
  • Write an equation of a line with the given slope and y-intercept. m=1/4 b=-3/4
    6·2 answers
  • The post office has a picture on display whose dimensions are 2 ft long and 3ft tall. What is the ( in square feet of the pictur
    14·1 answer
  • If 2/3 = x/y then witch of the following must be true?
    14·1 answer
  • In an inscribed quadrilateral, angles A & B are opposite angles and C & D are opposite angles. The measure of angle C =
    8·1 answer
  • Write a word problem that represents this equation 5s+6=46
    9·1 answer
  • Which values from the given replacement set make up the solution set of the inequality?
    15·2 answers
  • Please help, hard question
    12·1 answer
  • 1 point
    6·1 answer
  • Please help me plz I need help
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!