All categories

2 years ago

4. The walls and the ceiling of a

Mathematics

1 answer:

Grace [21]2 years ago

8 0

Step-by-step explanation:

You need to find the area of the room's walls.

Remember that area of a rectangle is $A = length * breadth$

Find the area of all FIVE areas to be plastered. Four walls and one ceiling.

There is one GOTCHA in here! The heigth is given in cm. You'll need to convert this to meters.

With the area, you can multiply by the cost given.

$Cost = 8.5 * \text{Area of all the walls and ceiling}$

You might be interested in

Which situation can be represented by this equation? <br> 2,500 + 40x = 7,300-60x

koban [17]

Answer:

x= 48

Step-by-step explanation:

$2500+40x+60x=7300\\40x+60x=7300-2500\\100x=7300+2500\\100x=4800\\x=4800/100\\x=48$

4 0

3 years ago

The area of the rectangle as a single expression

Ne4ueva [31]

Answer: $A=15x^2+6x-48$

Step-by-step explanation:

The area of a rectangle can be calculated with this formula:

$A=l*w$

Where "l" is the length and "w" is the width.

You can identify from the figure that the length and the width of this rectangle are:

$length=3(x+2)\\width=5x-8$

Then, you need to substitute this lenght and this width into $A=l*w$ :

$A=3(x+2)(5x-8)$

Now, apply Distributive property:

$A=(3x+6)(5x-8)\\\\A=15x^2-24x+30x-48$

Finally, you need to add the like terms. Then, you get:

$A=15x^2+6x-48$

5 0

3 years ago

I need help I did most of them but not sure if there right if you could tell me that would be great. Also can you help me with 9

Andrej [43]

Explanation:

In the given identified the following with reasons.

1. Given

2. Corresponding Angles postulate

3. Reflexive property of congruence

4. AA similarity postulate.

5. Triangle proportionate

6. Cross multiply

7. Distributive property of equality

8. Subtraction property of equality

9. Division property of equality

10. Prove

8 0

3 years ago

What is the equation of circle whose centre is (0,0) and radius'r' ?

adoni [48]

Answer:

On the right is a circle with centre (0, 0), radius r and (x, y) any point on the circle. Distance between (0,0) and (x, y) equals the radius, r. If the centre is (0, 0), the equation of the circle will be of the form x2 + y2 = r2.

4 0

2 years ago

A carpenter designs two cabinets: one in the shape of an oblique rectangular prism and one in the shape of a right

natulia [17]

Answer:

The cabinets have the same base area.
The cabinets may have the same base dimensions.
The cabinets may have different base dimensions.

Step-by-step explanation:

The volume of a prism is the product of its base area and height. It doesn't matter whether the prism is right or oblique, and the shape of the base is immaterial.

Both the given prisms have the same volume and height, so their base areas must be the same. The dimensions of the base may be the same, but do not have to be the same.

6 0

3 years ago

Read 2 more answers