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
Mice21 [21]
3 years ago
13

What is the sum if the first 22 terms of the following series? 86 + 79 + 72 + 65 +58+...

Mathematics
1 answer:
Arturiano [62]3 years ago
5 0
Seems to be an arythmetic sequence
Sn=[n(a1+an)]/2
where
Sn means sum of all terms up the nth term
n=number of terms
a1=first term
an=nth term

so from 86 to the 22th term is from a1 to a22

find teh sequence
miknus 7 each time
an=a1+d(n-1)
an=87-7(n-1)
find 22n term
a22=87-7(22-1)
a22=87-7(21)
a22=87-147
a22=-60

S22=[22(87-60)]/2
S22=[22(27)]/2
S22=594/2
S22=297

the sum is 297

You might be interested in
A room is 15 feet tall. An architect wants to include a window that is 6 feet tall. The distance between the floor and the botto
Ivenika [448]

Answer:

the independent variable in this equation is a because its the answer and cannot be changed

4 0
3 years ago
I’m stuck lol pls help
GarryVolchara [31]

Answer:

x=90

Step-by-step explanation:

So, since x-20 is the vertical angle directly near 70, we can say:

x-20=70.

if we solve x is 90.

HOPE IT HELPS!!!!!!!!!!!

4 0
3 years ago
PLEASE!! gr10 math 45pts
velikii [3]

Answer:

Step-by-step explanation:

the math is the nexlation when the filaction comes to hand and then u add with the nexlation and that the answer

3 0
3 years ago
Equivalent expression to −5.55−8.55c+4.35c
Y_Kistochka [10]
-5.55-8.55c+4.35c 2nd and 3rd term is like term we can connect. -digit have to larger number than +digit so the sign will be negative
-5.55-4.2c there is no like term to connect
Hence this is the answer
5 0
2 years ago
The grades on a geometry midterm at Springer are roughly symmetric with = 68 and o = 2.0.
snow_lady [41]

Answer:

Z = 0.5

please follow up q q uagh

8 0
3 years ago
Other questions:
  • 0.25[2.5x+1.5(x-4)]=-x
    15·1 answer
  • 15/17 in simplified, rational form?
    6·1 answer
  • Helppppppp pleaseeee
    5·1 answer
  • F minus 3/5 equals 4 1/5
    5·1 answer
  • Can someone help me i will give brainliest.
    5·1 answer
  • .determine if the ratios are proportional 10/12,20/32
    10·1 answer
  • How to find the shaded area
    11·1 answer
  • Please answer, thank you
    14·1 answer
  • Complete the table, and graph the pairs of values.
    10·1 answer
  • Can someone help me on letters B and C?
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!