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
sertanlavr [38]
3 years ago
10

What is the first term in a geometric sequence if the common ratio is −2 and the sum of the first five terms is 77?

Mathematics
1 answer:
kirza4 [7]3 years ago
5 0
Answer is a1 = 7

Using equation (derived from formula to find sum of values in a geometric series),
77 \:  =  \frac{a(1 - (  { - 2}^{5}))}{1 - ( - 2)}
Hence, solve for a.
You might be interested in
Which of the following expressions could be used to find the sale price of an item that costs d dollars if it is on sale for 30%
Elenna [48]

Greetings!

An item at full price is 100%, or by using the percentage formula: (\frac{percentage}{100})

If something is at 30% off, that means it is 70% of the original price (because minus the percentage from the 100%)

So by substituting the numbers into the percentage formula you end up with:

(\frac{70}{100}) which is 0.7

So your answer would be D, 0.7!


Hope this helps!

6 0
3 years ago
Which statement compares the two numbers correctly?
Vsevolod [243]

Answer:

1

Step-by-step explanation:

6 0
3 years ago
What’s an inverse operation?
yulyashka [42]
The opposite of a equation. Such as addition will be subtraction
4 0
2 years ago
At 2pm two military convoys leave Eagle River Wisconsin one headed North and 1 headed South the convoy headed North averages 50
skelet666 [1.2K]

Answer:

The answer to the question is

1.5 hours that is;

When the distance between them is more then 135 miles is after 1.5 hours and they will lose radio contact at 3:30 p.m.

Step-by-step explanation:

We note that

The speed of the military convoy headed north =50 mph

The speed of the convoy headed south  = 40 mph

Let t be the time taken for the two convoys to be 135 miles apart

The time taken for the two convoys to be 135 miles apart is given by

50×t miles+ 40×t miles= 135 miles

That is 90×t miles = 135 miles

                  t = 135/90 = 1.5 hrs

3 0
3 years ago
What fraction of 2 1/8 is 6?
Dima020 [189]
1/8th is the fraction that is equal to six
5 0
3 years ago
Other questions:
  • IM SUPER BAD AT MATH SO PLZZZ HELP I WOULD APPRECIATE ITTTT PLZZ​
    11·1 answer
  • How many months have 28 days in it
    6·2 answers
  • 5(x+2y)−3=3x+5 <br> 4(x−3y)−50=−33y <br><br> X=? Y=?
    7·1 answer
  • Are these two functions inverses?<br> O res<br> No
    8·2 answers
  • The ratio of the current ages of two RSM summer camp students Dylan and Mike is 3:4. If Dylan had been 6 years younger and Mike
    9·1 answer
  • HELP PLEASE! Felipe will rent a car for the weekend. He can choose one of two plans. The first plan has an initial fee of 57 and
    13·1 answer
  • There are $15$ gymnasts in the Olympic women's competition, including $4$ Americans. The gold medal goes to first place, silver
    6·1 answer
  • 45 + 9/4 + 4 + 12/20
    9·2 answers
  • What percent of 145 is 82​
    14·1 answer
  • Find the value of the expression when x = 2, y = - 4 and z = ½.
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!