2 years ago

Decompose the number 80

Mathematics

1 answer:

Anna35 [415]2 years ago

5 0

80+0 is the number decomposed.

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If a = 2, b = 4 and c = 5, then what is the value of this expression? 5a + 3c - 2b

skad [1K]

Its quite simple. All you have to due is substitute the numbers they gave you for each letter. So.... it would look like this > 5(2) + 3(5) - 2(4) = ? Now all you have to do is solve it! Hope this helps :)

8 0

2 years ago

5 of 8

aleksandr82 [10.1K]

Given:

The mean age of 5 people in a room is 26 years.

A person enters the room. The mean age is now 33.

To find:

The age of the person who entered the room.

Solution:

Formula for mean:

$\text{Mean}=\dfrac{\text{Sum of observations}}{\text{Number of observations}}$

The mean age of 5 people in a room is 26 years.

$26=\dfrac{\text{Sum of ages of 5 people}}{5}$

$26\times 5=\text{Sum of ages of 5 people}$

$130=\text{Sum of ages of 5 people}$

The mean age is now 33. It means, the mean age of 6 people is 33.

$33=\dfrac{\text{Sum of ages of 6 people}}{6}$

$33\times 6=\text{Sum of ages of 6 people}$

$198=\text{Sum of ages of 6 people}$

Now, the age of the person who entered the room is

Required age = Sum of ages of 6 people - Sum of ages of 5 people

= $198-130$

= $68$

Therefore, the age of the person who entered the room is 68 years.

6 0

2 years ago

Solve for x 4x = 51 1. x = 204 2. x = 47 3. x = 12.75

s344n2d4d5 [400]

Answer:

C) 12.75

Step-by-step explanation:

4x=51

x=51/4

x=12.75

6 0

2 years ago

Abby is adopting kittens from the pet store. if there are 18 kittens, how many ways can she choose 2 kittens?

Bas_tet [7]

Answer:

I believe 9

Step-by-step explanation:

18/2=9 i think this is your answer

4 0

2 years ago

<img src="https://tex.z-dn.net/?f=6%20%5Ctimes%20x%20%3D%20%20-%2024" id="TexFormula1" title="6 \times x = - 24" alt="6 \times

Finger [1]

The missing number is 4

8 0

3 years ago