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3 years ago

Simplify 7 – (–12) – 5

Mathematics

1 answer:

kherson [118]3 years ago

5 0

Answer:

Step-by-step explanation:

1. Do the "Two Mark" Rule

- 7 + (+12) - 5

2. Do your addition before subtracting

- 7 + 12 = 19

3. Subtract your remaining two numbers

- 19 - 5 = 14

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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

At the movie theatre, child admission is $5.40 and adult admission is $8.70 . on friday, 159 tickets were sold for a total sales

blondinia [14]

Alright this is gonna be a long one

Lets called child tickets x and adult tickets y

so x + y should be equal to 159 since they said that the total sum of the tickets is 159
so thats your first equation : x + y = 159

next form an equation using the prices,
5.40x + 8.70y = 1079.70

now that you have your two equations, just substitute the first into the second (you could either substitute for x or y by saying x = 159-y or that y=159-x)

Hope this helps.

7 0

3 years ago

Determine the remainder when (x3 – 5x2 14x – 5) is divided by (x 3)

Bogdan [553]

Hello,

P(x)=x^3-5x^2+14x-5

P(-3)=(-3)^3-5*(-3)²+14*(-3)-5=-119
Remainder=-119

6 0

3 years ago

Read 2 more answers

Help please I have 10 minutes !!

Ymorist [56]

Answer:

Step-by-step explanation: