3 years ago

sum of the 5th and 10th terms of an arithmetic sequence which are equal to the 20th term (80). find the 30th term

Mathematics

1 answer:

inysia [295]3 years ago

8 0

Yo sup??

a5=a+4d

a10=a+9d

a20=80=a+19d

a+4d+a+9d=a+19d

a=6d

80=6d+19d

80=25d

d=3.2

a=19.2

a30=a+29d

=19.2+92.8

=112

Hope this helps.

You might be interested in

Someone help me on this ASAP

Anvisha [2.4K]

So I think the answer to m<5 is 75 degrees

6 0

2 years ago

Read 2 more answers

If Darlene reads 5/8 of a 56 page book how many pages did she read?

Marina86 [1]

Darlene read 35 pages of the book.

5 0

2 years ago

Read 2 more answers

You are in charge of planning a reunion party for your high school alumni. The food will cost $12 per person. The rental fee for

castortr0y [4]

Answer:

$3820 total, $32 per alumnus.

Step-by-step explanation:

The total cost will be $12\times120+650+730+1000=3820$

Each alumnus pays $\frac{3820}{120} =31\frac{5}{6}$

Rounding to nearest whole number = $32 per alumnus.

5 0

1 year ago

Y = - 2/3x + 2 in standard form

Lesechka [4]

Answer:

2x + 3y = 6

Step-by-step explanation:

2x + 3y = 6

-2x. -2x

3y/3 = -2x + 6/3

Y = -2/3x + 2

4 0

2 years ago

Pls solve this...need help thanks :)

WINSTONCH [101]

Step-by-step explanation:

2² * 3 * 5 = 4 * 3 * 5 = 60.

3² * 5² = 9 * 25 = 225.

7 0

2 years ago

Read 2 more answers