When a number is doubled and 5 is subtaracted from the result,the answer is 37.what is the number?

Answers

Answer 1

Answer: x is a number
x is doubled
then 5 is subtracted means
2 times x-5
2x-5
result is 37
2x-5=37
solve
add 5 to both sides
2x+5-5=37-5
2x+0=42
2x=42
divide both sides by 2
2/2x=42/2
1x=21
x=21

the number si 21

Answer 2

Answer: You need to work this question backwards.
If you know the answer is 37, you need to therefore, add 5 (because it says it has been subtracted in the question)
This will give you 42.
Because the question then says this number has been doubled - you should halve it.
This will give you 21.
To check your answer, use this number, and do as the question shows you...
21 x 2 - 5. Does this equal 37?
Yes, then you must be correct :)

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Suppose that S and T are on points on the number line.If ST=20 and S lies at 3, where could T be located?

Answers

Answer: T= 6.66

Step-by-step explanation:

ST = 20 and S=3

(3)T = 20

T= 20 \ 3

T= 6.66

Jessica cannot remember the correct order of the five digits in her ID number. She does remember that the ID number contains the digits 9, 0, 3, 1, 5. What is the probability that the first four digits of Jessica's ID number will all be odd numbers?

Answers

Answer:

80%

Step-by-step explanation:

Since 4 of those 5 numbers are odd, the probability that the ID's first 4 numbers being odd is 4/5 which is 80%

What is eight dozen in standard form?

Answers

assuming 8 dozen is 96 not 8000000000000 it would be 9.6x10¹. If it is 8000000000000 then it's 8x10¹²

What is the angle between the hour and minute hand when it is 4:20?

Answers

$Look\ at\ the\ picture.\n\n\beta=360^o:12=30^o\n\n(20min)/(1h)=(20min)/(60min)=(1)/(3)\n\n\alpha=(1)/(3)\cdot30^o=10^o\leftarrow answer$

The arc between the 4 and the 5 is (360/12) = 30 degrees.

The hour hand takes a full hour to creep from the 4 to the 5, so it moves
at the rate of ( 30 degrees / 60 minutes ) = 1/2 degree per minute.

In 20 minutes, the hour hand moves (20 x 1/2) = 10 degrees.

At 4:20 , the minute hand is right square on the 4, and the hour hand
is 10 degrees ahead, on its way to the 5 .

The angle between them is 10 degrees.

Evaluate cube root of 5 multiplied by square root of 5 over cube root of 5 to the power of 5 . 5 to the power of negative 1 over 6 5 to the power of 3 over 2 5 to the power of 5 over 2 5 to the power of negative 5 over 6

Answers

Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions.

Convert everything to exponential form, and then use the rules for working with exponents.
cube root of 5 = 5^⅓
²√5 = 5^½
cube root of 5 to the power of 5 =5^(5/3)
Therefore, cube root of 5 multiplied by square root of 5 over cube root of 5 to the power of 5 = 5^(⅓ + ½ - (5/3)) = 5^{(2 + 3 - 10)/6} = 5^(-5/6)

The answer should be 5 to the power of negative 5 over 6

Answer:

5^-5/6 d

Step-by-step explanation:

Find an exact value cos(19pi/12)

Answers

$cos\left ( (9\pi)/(12)\right )=\frac{\sqrt{2-√(3)}}{2}$

Step-by-step explanation:

We know that

cos 2x = 2cos²x - 1

So we have

$cosx=\sqrt{(1+cos2x)/(2)}$

Substituting $x=(19\pi)/(12)$

$cos\left ( (19\pi)/(12)\right )=\sqrt{(1+cos2\left ( (19\pi)/(12)\right ))/(2)}\n\ncos\left ( (19\pi)/(12)\right )=\sqrt{(1+cos\left ( (19\pi)/(6)\right ))/(2)}\n\ncos\left ( (9\pi)/(12)\right )=\sqrt{(1+cos570)/(2)}\n\ncos\left ( (9\pi)/(12)\right )=\sqrt{(1-(√(3))/(2))/(2)}\n\ncos\left ( (9\pi)/(12)\right )=\sqrt{(2-√(3))/(4)}\n\ncos\left ( (9\pi)/(12)\right )=\frac{\sqrt{2-√(3)}}{2}$

$cos\left ( (9\pi)/(12)\right )=\frac{\sqrt{2-√(3)}}{2}$

19 π / 12 = 19 * 180° / 12 = 285 °
cos ( 19 π / 12 ) = cos 285° = cos ( - 75° ) = cos 75°
cos 75° = cos ( 45° + 30° ) = cos 45° cos 30° - sin 45° sin 30° =
= ( √2 / 2 · √3/2 ) - ( √2 / 2 · 1/2 ) = √6/4 - √2/4 =
= ( √6 - √2 )/ 4

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