2 years ago

What is the answer to this question? Twice r is 20

Mathematics

1 answer:

Allushta [10]2 years ago

5 0

Answer:

2r = 20

So, r = 10

Step-by-step explanation:

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What is the first term in the sequence for which d = -2 and a7 = 3?

AnnZ [28]

Answer:

Final answer is c. 15

Step-by-step explanation:

We need to find about what is the first term in the sequence for which d = -2 and a7 = 3

We will use nth term formula of arithmetic sequence.

$a_n=a+\left(n-1\right)d$

we have been given a7 that means 7th term is 3

so plug n=7, d=-2 and a_n=3 into above formula

$3=a+\left(7-1\right)(-2)$

$3=a+6(-2)$

$3=a-12$

$15=a$

Hence final answer is c. 15

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Write 13/40 as a decimal?

borishaifa [10]

0.325 is the answer. :)

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2 years ago

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Find the values of which satisfy the equation. 2 cos (2B+30°) = -√3 in the domain OP ≤B≤360°

PSYCHO15rus [73]

Answer:

60 and 90

Step-by-step explanation:

$2 \cos(2 \beta + 30) = - \sqrt{3}$

$\cos(2 \beta + 30) = - \frac{ \sqrt{3} }{2}$

$2 \beta + 30 = \cos {}^{ - 1} ( \frac{ - \sqrt{3} }{2} )$

First solution.

$2 \beta + 30 = 150$

$2 \beta = 120$

$\beta = 60$

Second solution

$2 \beta + 30 = 210$

$2 \beta = 180$

$\beta = 90$

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Answer:

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Step-by-step explanation:

the health is this you awnser le ? I uh what?

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The larger of two number is 5 more than the smaller. The smaller number plus the twice the larger equals 100. Find the numbers

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Answer:

smaller number :30

larger number : 35

Step-by-step explanation:

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