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3 years ago

3( 3v +5 ) = 39 Solve this problem

Mathematics

2 answers:

IRISSAK [1]3 years ago

7 0

Answer:

v = 8/3

Step-by-step explanation:

The goal here is to find the value of the variable, v, that makes this equation true. We go through a series of steps meant to isolate v on the left side and find the proper value to go on the right side. Here is one way of doing this:

Multiply, as indicated: 9v + 15 = 39.

Isolate 9v by subtracting 15 from both sides: 9v = 24.

Finally, divide both sides by 9 to obtain v = 8/3

An alternative approach follows:

Divide both sides of 3(3v + 5) = 39 by 3, obtaining 3v + 5 = 13.

Subtract 5 from both sides: 3v = 8

Divide both sides by 3: v = 8/3 (same as before)

V125BC [204]3 years ago

5 0

Answer:

V= 8/3

Step-by-step explanation:

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Answer:

Step-by-step explanation:

Given : In a state where license plates contain six digits.

Probability of that a number is 9 = $\dfrac{1}{10}$ [Since total digits = 10]

We assume that each digit of the license number is randomly selected .

Since each digit in the license plate is independent from the other and there is only two possible outcomes for given case (either 9 or not), so we can use Binomial.

Binomial probability formula: $P(X=x)=^nC_xp^x(1-p)^{n-x}$

, where n= total trials , p = probability for each success.

Let x be the number of 9s in the license plate number.

$X\sim Bin(n=6, p=\dfrac{1}{10}})$

Then, the probability that the license number of a randomly selected car has exactly two 9's will be :

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3 years ago

Three single-digit numbers multiply to make 504 Write the missing numbers

boyakko [2]

We will guess and check to solve this problem

504/9= 56
504/8= 63
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504/6= 84
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we can continue the pattern. However, we know that 50 is the product of 8 and 7, so we can use that number

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3 years ago

Nina has some nickels and 9 pennies in her pocket. Her friend, Maurice has twice as many nickels as Nina. Together these coins a

algol13

So Maurice would have 2N nickels

Total number of coins is N + 2N + 9 = 3N + 9

Each nickel is 5 pennies

3N of nickels = 15N pennies

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Their worth is 84 cents

15N + 9 = 84

15N = 75

N = 75/15 = 5

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This means Nina has 5 nickels.

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3 years ago

Prove that the difference between a two-digit number and the product of its digits will always be a 2 digit number.

slamgirl [31]

Step-by-step explanation:

Let the two-digit number is $xy$

This can be written as:

10x + y, where 1 ≤ x ≤ 9 and 0 ≤ y ≤ 9

The difference between the number and product of its digits is:

d = 10x + y - xy

Rewrite this as below:

d = 10x - xy + y - 10 + 10 =

x(10 - y) - (10 - y) + 10 =

(x - 1)(10 - y) + 10

We see that:

0 ≤ x - 1 ≤ 8 according to the condition given above
1 ≤ 10 - y ≤ 10 again according to the condition given above

The value of d is then:

0 + 10 ≤ d ≤ 8*10 + 10
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<h3>Proved</h3>

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