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tatuchka [14]
3 years ago
7

Help me now pls I need it​

Mathematics
1 answer:
Elena L [17]3 years ago
4 0

Answer:

130

Step-by-step explanation:

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What is the sum of the n terms of the series 4 + 12 + 36 + 108 + . . . ?
arlik [135]
Sum of n terms of a geometric series is
Sn = a1 (r^n-1)/(r-1)
a1 = 1st term = 4
r = common ratio = 12/4 = 3
so, the sum is
Sn = 4 (3^n-1)/(3-1) = 2(3^n-1)
8 0
3 years ago
8 times 51 show your work
SCORPION-xisa [38]

8x51. 8x50=? 8x5=40. 40 x 10 = 400 8x50=400. 8x1=8 400+8=408.
4 0
3 years ago
Help i must get this correct i will make u brainllest<br>plzzz anyone
Fofino [41]

Answer:

22

Step-by-step explanation:

x-1 is a midsegment.

According to the Triangle midsegment theorem, x-1 is half of the third side (42)

x-1 = 42/2

x-1 = 21

x= 22

or

2x-2=42

2x=44

x=22

Hope this helps!

6 0
3 years ago
Read 2 more answers
What is the function for the arithmetic sequence 2,7,12,17,22
Deffense [45]


The common difference, d, is 5 and the starting value, a, is 2.
Filling this in the form of x_n=a+d(n-1)

<span>you get

</span>x_n = 2+5(n-1)
3 0
3 years ago
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How do you do this problem? 3x+1=10
Vlad1618 [11]
This should help 10-1=9 9÷3=3 x=3
5 0
3 years ago
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