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
Lyrx [107]
2 years ago
14

The sum of the first 15 terms of a geometric sequence with 7 as the first term and a common ratio of -3 is __________.

Mathematics
1 answer:
Andre45 [30]2 years ago
4 0

Step-by-step explanation:

the formula for the sum of the first n terms of a geometric sequence is

Sn = s1(1 - r^n)/(1 - r)

with r being the common ratio and s1 is the first term.

so,

S15 = 7×(1 - (-3)¹⁵)/(1 - -3) = 7×(1 - -14,348,907)/4 =

= 7×14,348,908/4 = 7×3,587,227 = 25,110,589

You might be interested in
Pls pls pls pls pls help me out​
Bad White [126]

12% is the percent decrease

95,920 is 88% of 109,000.
x/100 = 95,920/109,000

95,920 x 100 = 9,592,000

9,592,000 / 109,000 = 88

100 - 88 = 12

Since it is 88% of it, it decreased by 12%

5 0
2 years ago
Read 2 more answers
Prove that the trajectory of a projectile is parabolic, having the form y = ax + bx2. To obtain this expression, solve the equat
olga_2 [115]

Answer: y = v₀tgθx - gx²/2v₀²cos²θ

a = v₀tgθ

b = -g/2v₀²cos²θ

Step-by-step explanation:

x = v₀ₓt

y = v₀y.t - g.t²/2

x = v₀.cosθt → t = x/v₀.cosθ

y = v₀y.t - g.t²/2

v₀y = v₀.senθ

y = v₀senθ.x/v₀cosθ - g/2.(x/v₀cosθ)²

y = v₀.tgθ.x - gx²/2v₀²cos²θ

a = v₀tgθ → constant because v₀ and θ do not change

b = - g/2v₀²cos²θ → constant because v₀, g and θ do not change

8 0
3 years ago
WILL GIVE BRAINLIEST ANSWER TO WHOEVER IS ABLE TO FULLY AND CORRECTLY ANSWER THIS QUESTION. Consider and trapezoid in the follow
FinnZ [79.3K]

This is an isosceles trapezoid, because the two angles are supplementary on the right side.

y is 25 based on the Pythagorean theorem

w is sqrt (850)=29.15

z must be 15

Making a right triangle to look at the altitude

cos 59=a/15, so a is 7.73 between the right corner and the edge of x

 

That means x is 29.15-2(7.73)=13.69

=============

The median should be half way between 13.69 and 29.15

That is half their sum, or half of 42.84 or 21.42

That doesn't change the answer above

Once I know the trapezoid is isosceles, the angles at the base have to be 59d and the angles at the top 121d.

please mark brainliest!

7 0
3 years ago
Samantha opened a savings account and deposited $200.00. The account earns 10% interest, compounded monthly. If she wants to use
noname [10]

Answer:

200(1.10^1)

Step-by-step explanation:

6 0
2 years ago
Simplify the expression below: 3(7x) -2(4-x)
Anna35 [415]

the correct answer is C to this question

4 0
2 years ago
Read 2 more answers
Other questions:
  • The variable z is inversely proportional to x. When x is 16, z has the value 0.9375. What is the value of z when x= 26?
    13·1 answer
  • Is this a function???????
    14·1 answer
  • 50 POINTS!!! Use the quadratic formula above to solve for h(t) = -4.9t^2 + 8t + 1 where h is the height of the ball in meters an
    6·2 answers
  • The length of a rectangular garden is three feet less than twice it’s width. If the perimeter of the garden is 42 feet, what is
    7·1 answer
  • How many -pound bags of soap flakes can Mr. Newman fill?
    14·2 answers
  • Write an expression for the amount that Elaine earns per day. <br> A.32+d<br> B.32d<br> C.32/d
    7·1 answer
  • Answer and explanation please.
    8·1 answer
  • PLEASE HELP
    10·2 answers
  • Please help!! Would be appreciated:)
    5·2 answers
  • Do the quantities combine?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!