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Crazy boy [7]
2 years ago
8

the sum of Ages of two brother is 18the elder brother is 10 years older than younger brother then what are the ages of those bro

thers​
Mathematics
1 answer:
NemiM [27]2 years ago
4 0

Answer:

Age of younger brother is 4 years..

And age if elder brother is 14 years.

Step-by-step explanation:

Let us denote 'x' as the age of smaller brother,

then, the age of younger brother will be x+10 years.

x+x+10 = 18

2x+10 = 18

2x = 18-10

2x = 8

x = 8/2

x = 4

Age of younger brother is 4 years.

Age of elder brother = x + 10

= 4 + 10

= 14 years.

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XxX+2y÷2w+3z<br> X=5 w=2 y=8 z=3
Oksana_A [137]

Answer: 38

Step-by-step explanation:

There is a rule between operations. I mean that you have to follow these stpes:

   Parentheses

   Exponents

   Multiplication

   Division

   Addition

   Subtraction

You can remember as "Please Excuse My Dear Aunt Sally" or PEMDAS.

In this question: 5x5+2.8÷2.2+3.3= 25+16÷4+3=25+4+9=38

4 0
3 years ago
Thirty percent of all telephones of a certain type are submitted for service while under warranty. Of these, 70% can be repaired
Varvara68 [4.7K]

Answer:

X \sim Binom(n=10, p=0.3)

And for this case we want to find this probability:

P(X =2)

And we can use the probability mass function and we got:

P(X=2)=(10C2)(0.3)^2 (1-0.3)^{10-2}=0.233

Step-by-step explanation:

Previous concepts

A Bernoulli trial is "a random experiment with exactly two possible outcomes, "success" and "failure", in which the probability of success is the same every time the experiment is conducted". And this experiment is a particular case of the binomial experiment.

The binomial distribution is a "DISCRETE probability distribution that summarizes the probability that a value will take one of two independent values under a given set of parameters. The assumptions for the binomial distribution are that there is only one outcome for each trial, each trial has the same probability of success, and each trial is mutually exclusive, or independent of each other".

The probability mass function for the Binomial distribution is given as:  

P(X)=(nCx)(p)^x (1-p)^{n-x}  

Where (nCx) means combinatory and it's given by this formula:  

nCx=\frac{n!}{(n-x)! x!}  

Solution to the problem

Let X the random variable of interest, on this case we now that:

X \sim Binom(n=10, p=0.3)

And for this case we want to find this probability:

P(X =2)

And we can use the probability mass function and we got:

P(X=2)=(10C2)(0.3)^2 (1-0.3)^{10-2}=0.233

4 0
2 years ago
Which of the following is true about the diagonals of a rectangle? Select all that are true.
jok3333 [9.3K]

Step-by-step explanation:

Diagonals are congruent.

C) Diagonals are perpendicular.

D) Diagonals bisect the angles.

8 0
2 years ago
THIS IS REALLY IMPORTANT 7TH GRADE MATH:
Oksana_A [137]

Rectangle perimeter is 53 meters.

L = W + 2.3

To find the options of a perimeter, divide by 4.

= 13.25

So if this was a square, it would be 13.25 for both L and W but it's not.

Since the W has 2.3 meters more then the L, we do this.

13.25 + 2.3 = 15.55

13.25 - 2.3 = 10.95

Two of your sides equal 15.55, and the other two equal 10.95.

Hope this helps!

3 0
3 years ago
Please help thank you very much
sineoko [7]

Answer:

96

lower right

Step-by-step explanation:

Part 1

Givens

a1 = - 20

d = +4

n = 30

Equation

a30 = a1 + (n - 1)d

Solution

a30 = -20 + (30 - 1)*4

a30 = -20 + 29*4

a30 = - 20 + 116

a30 = 96

=====================

Part 2

Formula

Sum = (a1 + L)*n/2

n = 30

So only the two on the right can be considered

a1 = -20

L = 96

Sum = (-20 + 96)30/2 is the bottom right. D if you think of it that way.

8 0
3 years ago
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