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Ivanshal [37]
3 years ago
8

A suitcase has a lock on it consisting of three numbers. Each number could be any

Mathematics
1 answer:
Viktor [21]3 years ago
8 0

Answer:  810

<u>Step-by-step explanation:</u>

There are 10 numbers to choose from.  Since the 2nd digit and 3rd digit cannot repeat the number before it, they only have 9 numbers to choose from.

1st digit         and          2nd digit        and        3rd digit

10 choices      x            9 choices         x          9 choices      =  810

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A community hall is in the shape of a cuboid the hall is 40m long 15m high and 3m wide. 10 litre paint covers 25m squared costs
Darina [25.2K]

Answer:

Total cost for tiles and paints is $924.  

Step-by-step explanation:

We have been given that a community hall is in the shape of a cuboid. The hall is 40m long 15m high and 3m wide.

The paint will be required for 4 walls and ceiling.

Let us find area of walls and ceiling.

\text{Area of walls and ceiling}=(2*40*15)+(2*3*15)+(40*3)

\text{Area of walls and ceiling}=1200+90+120

\text{Area of walls and ceiling}=1410

Therefore, the area of walls and ceiling is 1410 square meters.

Given: Cost for 10 litre of paint is $10 and 10 litre paint covers 25 square meter. Therefore,  

\text{ The total painting cost}=10*(\frac{1410}{25})

\text{ The total painting cost}=10*56.4=564

Therefore, the total painting cost is $564.  

Tiles will be required for floor. Let us find the area of floor.

\text{Area of floor} = 40*3\text{ square meters}

\text{Area of floor} =120\text{ square meters}

Given: 1m squared floor tiles costs $3. So,  

\text{Total cost for tiles} = 3*120 = 360

Therefore, the total tiles cost is $360.

Now let us find combined total cost of tiles and paint.

\text{Combined total cost}= 564+360 = 924

Therefore, the combined total cost of tiles and paint is $924.

6 0
3 years ago
(5•10^-2) x (2•10^3)
Andre45 [30]

Answer:

100

Step-by-step explanation:

5•10^-2= 5•1/100 an d that's equal to 1/20 if you divide it with (2•10^3)wich is equal too 2000

you will get 100 as a result

6 0
3 years ago
Read 2 more answers
Courier charges for packages to a certain destination are 65 cents for the first 250 grams and 10 cents for each additional 100
SpyIntel [72]
Well, drop 65 cents (the first 250 grams) to get 90 remaining cents. These are 900 additional grams. So, the mass is 0.25+0.9=1.15 kg.
4 0
3 years ago
Can someone please help me solve this
pentagon [3]

Answer:

d

Step-by-step explanation:

A segment joining the midpoints of a triangle is

• Parallel to the third side

• Half the length of the third side

The segment DF joins the midpoints of 2 sides of Δ ABC , then

BC = 2 × DF = 2 × 4 = 8

5 0
2 years ago
Convert to an improper fraction. Type in your answer with the negative in the numerator. -11 1/3
vovangra [49]
The answer to the question is :

-11*3+1/3
=-33+1/3
= -32/3

Therefore, answer = -32/3
                                 


6 0
3 years ago
Read 2 more answers
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