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2 years ago

I add 3 and double it . Then half it and my answer is 6 , what was my number

Mathematics

2 answers:

rjkz [21]2 years ago

6 0

Answer:

Step-by-step explanation:

3 x 2 = 6 - 3 (half) = 3

nalin [4]2 years ago

3 0

Answer:

I think the answers to the question is 3

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Round 81.139 to the nearest tenth

Gnesinka [82]

If the number you are rounding is followed by 5, 6, 7, 8, or 9, round the number up (+1).

If the number you are rounding is followed by 0, 1, 2, 3, or 4, round the number down (no change).

81.139 ≈ 81.1

6 0

2 years ago

Read 2 more answers

If Sine (x) = two-fifths and tan(x) > 0, what is sin(2x)?

ElenaW [278]

B) $\frac{4\sqrt{21}}{25}$

Correct on Edge

4 0

2 years ago

Read 2 more answers

Please help me with these two math problems that I do not quite understand. This is urgent!

g100num [7]

Answer:

1) $a_{n}=a_{1}+(n-1)d\Rightarrow a_{n}=-1-2(n-1)\\a_{2}=-1-2(2-1)\Rightarrow a_{2}=-3\\a_{3}=-1-2(3-1)\Rightarrow a_{3}=-5\\(...)\\a_{10}=-1-2(10-1)=-19$

2) $a_{10}=4+8(10-1)\Rightarrow a_{10}=76$

Step-by-step explanation:

1) To write an Arithmetic Sequence, as an Explicit Term, is to write a general formula to find any term for this sequence following this pattern:

$a_{n}=a_{1}+d(n-1)\Rightarrow \left\{\begin{matrix}a_{n}=n^{th}\: term\\a_1=1st \: term \\d=\: difference\\n=n^{th}\, term\end{matrix}\right.$

"Write an explicit formula for each explicit formula A(n)=-1+(n-1)(-2)"

This isn't quite clear. So, assuming you meant

Write an explicit formula for each term of this sequence A(n)=-1+(n-1)(-2)

As this A(n)=-1+(n-1)(-2) is already an Explicit Formula, since it is given the first term $a_{1}=-1$ the common difference $d=-2$ let's find some terms of this Sequence through this Explicit Formula:

$a_{n}=a_{1}+(n-1)d\Rightarrow a_{n}=-1-2(n-1)\\a_{2}=-1-2(2-1)\Rightarrow a_{2}=-3\\a_{3}=-1-2(3-1)\Rightarrow a_{3}=-5\\(...)\\a_{10}=-1-2(10-1)=-19$

2) $(4,12,20,28, ..)$ In this Arithmetic Sequence the common difference is 8, the first term value is 4.

Then, just plug in the first term and the common difference into the explicit formula:

$a_{10}=4+8(10-1)\Rightarrow a_{10}=76$

6 0

2 years ago

There are 5,000 employees in a company. Each year 20% of the employees retire, but the company hires 500 new employees after the

Genrish500 [490]

5,000/2=250
5,000-250+500= 5,025

I hope that is what you needed

8 0

3 years ago

Tom Quig traveled 240 miles east of St. Louis. For most of the trip he averaged 60 mph, but for one period of time he was slowed

Elan Coil [88]

Tom Quig traveled 280 miles east of St. Louis. For most of the trip he averaged 60 mph, but for one period of time he was slowed to 10 mph due to a major accident. If the total time of travel was 8 hours, how many miles did he drive at the reduced speed?

You will need to apply the "distance formula":

d = rt

where

d is distance

r is rate or speed

t is time

Let x = time driving at reduced speed

then

8-x = time driving at 60 mph

60(8-x) + 10x = 280

480 - 60x + 10x = 280

480 - 50x = 280

480 = 50x + 280

200 = 50x

4 hours = x

This means he spent 4 hours driving at 10 mph, the distance he drove at this rate then is:

4 * 10 = 40 miles

3 0

3 years ago