If the common difference in an arithmetic sequence is 4, and the 20th term is 36, what is the first term?

Answers

Answer 1

Answer: The sum of an arithmetic sequence can be found using the formula S = n/2(a + l) where S equals sum, n equals # terms, a equals the first term and l equals last term we know enough of these to find the missing pieces S = -15n = 20a = 4 -15 = 20/2 (4 + l) now we only have one unknown -15 = 10 (4 + l)-15 = 40 + 10l-55 = 10l l = -5.5 so the last term is -5.5 now we can use anothe formula to find the common difference l = a + (n-1) d so the last term equals the first term (a) plus # terms -1 times (d) the common difference -5.5 = 4 + (20-1) d -9.5 = 19 d d = -.5 so your common difference is -.5

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Its r9ght here just look at ut

Answers

Answer:

its 400 . 1200 divided by 3 in 400.

Step-by-step explanation:

What is the solution to the equation?5=2/5a

A.2

B.4 3/5

C.12 1/2

D.25

Answers

Answer:

Exact form - $(25)/(2)$

Decimal form - 12.5

Mixed number form - 12 $(1)/(2)$

Have a nice day.

The temperature is 18 farenheit at 7am. By 2pm,the temperature has gotten warmer by 28 degrees. What is the temperature at 2pm?

Answers

Answer: 46 degrees

Step-by-step explanation:

To find the temperature at 2 p.m., we can add the increase of 28 degrees to the initial temperature of 18 degrees.

18 + 28 = 46

Therefore, the temperature at 2 p.m. is 46 degrees Fahrenheit.

Happy to help; have a great day! If you liked my answer, please give me Brainliest :)

Could someone help me do this :D

Answers

y = side

Perimeter = 8y

Suppose you flip a coin and spin a spinner that is divided into 8 equal regions. Of the 8 equal regions, 3 are red, 4 are black and 1 green. What is the probability of "tails" on the coin, and the spinner landing on red?  (Hint: How many spaces are on the spinner total?)Immersive Reader(5 Points)

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Answer:

18.75%

Step-by-step explanation:

The probability of the coin is 1/2, because it only has two options (tail or head).

Now, in the case of roulette, it has a total of 8 options, and the red region has 3 parts, that is, of the 8 options, roulette 3 is red, therefore the probability is 3/8

Now the final probability is the multiplication of the probability of both events:

(1/2) * (3/8) = 0.1875s 18.75%

In other words, the probability of these two events happening, that the tail comes out and is red, i

Lana's family is planning a rectangular garden. They make a scale diagram of the garden using a scale of 1 inch to 0.5 meter. If the length of the scale diagram is 24 inches, and its width is 16 inches, what is the perimeter of the actual garden? 20 meters 40 meters 80 meters 160 meters. Please help me

Answers

Total inches: 24 x 2 + 16 x 2

= 48 + 32 = 80 inches

80 in x 0.5 = 40m

Therefore, answer is 40 metres

Answer:

the answer is 40 meters

Step-by-step explanation:

hope this helps!! <3

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