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Sergio [31]
3 years ago
11

-2, 10, -50. Find the next two terms of this sequence. Give exact values (not decimal approximations)

Mathematics
2 answers:
lyudmila [28]3 years ago
8 0

250 and - 1250

This is a geometric sequence with common ratio r = - 5

multiply each term by - 5 to obtain the next term

- 50 × - 5 = 250

250 × - 5 = - 1250

the sequence is - 2, 10, - 50, 250, - 1250


Radda [10]3 years ago
7 0

-20, 10, -50, 250, -1250 is the answer


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If tanA = 1/2 then evaluate cos A/sinA +sinA /1+cosA​
Deffense [45]

Answer:

√5.

Step-by-step explanation:

Tan A = 1/2 means that the right triangle containing angle A has legs of length 1 and 2 units. So the hypotenuse  = √(1^2 + 2^2) = √5  (using the Pythagoras theorem). The side opposite to < A = 1 unit and the adjacent side = 2 (as tan = opposite / adjacent).

so cos A =  adjacent / hypotenuse =   2/√5.

and sin A = opposite / hypotenuse = 1 / √5

cos A / sin A = 2/√5 /  1/ √5 =  2.

sin A / (1 + cos A) =  1/√5 (1 + 2/ √5)

=  1 / √5 ( (√5 + 2) /√5)

= 1 / (√5 + 2)

So the answer is:

2  +   1 /(√5 + 2).

We can simplify it further by multiplying top and bottom of the fraction by the complement of √5 + 2 which is √5 - 2.

2 + 1 / (√5 + 2)

= 2(√5 + 2) + 1 / (√5 + 2 )

= { 2(√5 + 2) + 1 } /  (√5 + 2)

Multiplying this by  √5 - 2 / √5 - 2 we get:

(2(5 - 4) + √5 - 2) /  (5 -4)

=  2 + √5 - 2 / 1

= √5.

3 0
3 years ago
Plz, help me if u cant answer both could you just answer one of them for me.
labwork [276]

Answer:

for 2. I don't think it can be a triangle

3 0
3 years ago
Read 2 more answers
The ratio of students to teachers is 2:3 respectively.If there are 21 teachers, how many students are there?
yulyashka [42]

Answer:14


Step-by-step explanation:

2:3

14:21

in 14 their is 2 7's

in 21 their is 4 7's


6 0
3 years ago
I don’t understand this problem
Rina8888 [55]

Answer:

Standard Deviation, σ = 6.5828058860438

Step-by-step explanation:

<u>Data Set:</u> 20, 11, 27, 13, 29, 20

The total numbers in the data set

Count, N = 6

The sum is all values in the data set is added up

20 + 11 + 27 + 13 + 29 + 20

Sum, Σx: 120

The mean is the sim / N

Mean, μ: 20

7 0
1 year ago
Suppose that 3 cards are drawn from a well-shuffled deck of 52 cards. What is the probability that all 3 are diamonds?
Marat540 [252]

There are 13 diamonds in the deck, so \dbinom{13}3 ways of drawing 3 diamonds.

There is a total of \dbinom{52}3 ways of drawing any 3 cards from the deck.

So the probability of drawing 3 diamonds is

\dfrac{\binom{13}3}{\binom{52}3}=\dfrac{11}{850}\approx0.012941

where \dbinom nk=\dfrac{n!}{k!(n-k)!}.

5 0
3 years ago
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