All categories

2 years ago

Find the missing terms. 3, _, _, 21 (arithmetic)

Mathematics

1 answer:

natka813 [3]2 years ago

6 0

Answer:

3, 9, 15, 21

Step-by-step explanation:

3x1=3 v

3x2=6

3x3=9 v

3x4=12

3x5=15 v

3x6=18

3x7=21 v

Skip one each time, 3, 9, 15, 21

You might be interested in

Work out the angle of size x

zzz [600]

Answer:

x=75

Step-by-step explanation:

$We\ are\ given\ that, \\Angle GFE=105\\We\ observe\ that, \\Angle\ GFE\ and Angle\ EFB\ form\ a\ linear\ pair\ and\ hence,\ are\ supplementary.\\Hence,\\Angle\ GFE\ + Angle\ EFB=180\\Hence,\\105+Angle\ EFB=180\\Angle\ EFB=180-105\\Angle\ EFB=75\\We\ know\ observe\ that\ Angle\ EFB\ and\ Angle\ ABC\ are\ corresponding\ angles\ and\ are\ equal\\Hence,\\Angle\ EFB\ = \ Angle\ ABC\\75=Angle\ ABC\\75=x\\x=75$

6 0

2 years ago

What are the first and last terms of this geometric series

11Alexandr11 [23.1K]

ANSWER

E. 10 and 640

EXPLANATION

The given series is

$\sum_{i=1}^45 \times 2^{2i-1}$

To find the first term of the series we substitute i=1 to get,

$a_1 = 5 \times {2}^{2 \times 1 - 1}$

$a_1 = 5 \times {2}^{ 1} = 10$

For the last term of the series, we substitute i=4 to obtain,

$a_4 = 5 \times {2}^{2 \times 4 - 1}$

$a_4 = 5 \times {2}^{7}$

This implies that,

$a_4 = 5 \times 128 = 640$

Therefore the correct answer is E

7 0

2 years ago

PLS HELP WILL GIVE BRAINLIEST<br><br> ignore the one i marked

Juliette [100K]

Answer:

im almost postive the one you marked is correct

Step-by-step explanation:

6 0

2 years ago

Read 2 more answers

Quincy, Ralph, Samantha and Teresa all joined a summer reading program. Quincy read five more books than Ralph did. Ralph read h

Dominik [7]

Answer:

Quincy read 9 books.

Step-by-step explanation:

Work backwards. Samantha read three less books than Teresa (11-3=8). Ralph read half as many books as Samantha (8/2 = 4). Quincy read five more books than Ralph (4 + 5 = 9).

5 0

2 years ago

an airplane is 4,000 feet above the ground .it begins to descend at a rate of 140 feet per minute.how many minutes will it take

kobusy [5.1K]

Answer:

Step-by-step explanation:

4 0

2 years ago

Find the missing terms. 3, _____, _____, 21 (arithmetic)

Find the missing terms. 3, _, _, 21 (arithmetic)