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SpyIntel [72]
3 years ago
12

This geometric sequence? What is the explicit formula for 8, 4, 2, 1, ...

Mathematics
1 answer:
scoundrel [369]3 years ago
5 0

Answer:

D

Step-by-step explanation:

the first term is 8, the ratio is 1/2 ( 8*1/2 = 4, 4*1/2 = 2, 2*1/2 = 1)

the formula for an explicit geometric formula is :

a_{n} = a_{1} * r^{(n-1)}

plug in your numbers :

a_{n} = 8 * (\frac{1}{2}) ^{(n-1)}

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Simultaneous Equations <br> 2x+4y=22 <br> 2x+2y=15
Aleks04 [339]

Answer:

x = 4

y = \frac{7}{2}

Step-by-step explanation:

Ummmm

I'm not sure if this is corrrect but this is what I got

So first you solve 2x+4y=22 to find x

and you get x = -2y+11

Then you have to subtitute -2y+11 for x in 2x+2y=15

which you then get y= \frac{7}{2}

After you have to subttitute y= \frac{7}{2}  for y in x = -2y+11

which you get as x=4

Finally you get the answer as:

x = 4

y = \frac{7}{2}

5 0
3 years ago
Kat plays a surfing video game with a friend. Each player earns 50 points for each trick he performs, but loses 40 points each t
Dahasolnce [82]

Step-by-step explanation:

No. of points got from 1 stunt = 50.

No. of points deducted from 1 fail = 40.

6 stunts and 9 falls were gained last week.

So, A/C the number of points earned =

(6×50)-(9×40)

= 300 - 360

= -60

Her score today is 3 times her score from last week so multiply by 3

= (-60) × 3

= -180

If it were multiplied by -3 instead of 3 it would be...

(-60) × (-3)

= 180

The difference would be that on multiplying with positive 3 she would be 180 points in the whole but multiplying with negative three means she is 180 points in the league.

The similarity is that that whole number is same but the symbol adds a difference and the absolute value would be same too.

3 0
2 years ago
1. WILL GIVE BRAINLIST TO BEST ANSWER
Varvara68 [4.7K]

Answer:

90/100

Step-by-step explanation:

if you look at the graph on the bottom part it tells you the study time if you line it the left side which says the test score. so if they studied for 80 mins they are expected to have the score of between 85 and 90.

4 0
2 years ago
Please help me ( ̄ ‘i  ̄;)
Anna [14]

Answer:

-6 + 4 = -2

Step-by-step explanation:

I know.

7 0
3 years ago
Read 2 more answers
2 2/5 x 4 = {Khan Academy}
Sophie [7]

Answer:

9.6 or 9 and 3/5

Step-by-step explanation:

turn 2 and 2 fifths into an improper fraction and multiply by four

7 0
2 years ago
Read 2 more answers
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