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soldi70 [24.7K]
3 years ago
11

A room is 8.5 m long,6.5 m broad and 3.4 m high. it has two doors, each measuring (2 m 1m).find the cost of painting its four wa

lls at £160 per m.
Mathematics
1 answer:
levacccp [35]3 years ago
4 0
Find the surface area of the 4 walls by doing
2(8.5x3.4) + 2(6.5x3.4)
Then subtract the area of the 2 doors , which is 4
So the total painted surface will come out to be 98m
Multiply 98 by the cost, £160 to get a total cost of £15680 to paint the room
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B

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3 years ago
Help me with these 3 questions, please
Zina [86]

Answer:

1. x = -4y ---> y = (-1/4)x

slope = -1/4. y-intercept = (0,0)

2. y = -2x + 4

3. y = (1/3)x - 1

Step-by-step explanation:

1. Re-write your equation so that x is on the right and y is on the left:

x = -4y ---> y = (-1/4)x

slope = -1/4. y-intercept = (0,0)

2. y-intercept = (0,4) ----> P1

x-intercrpt = (2,0) ----> P2

slope m = (y2 - y1) / (x2 - x1)

= (0 - 4)/(2 - 0)

= -2

therefore, y - y1 = mx - x1 ---> y - 4 = -2x

or y = -2x + 4

3. y-intercept = (0,-1)

x-intercept = (3,0)

m = (0 - (-1)) / (3 -0) = 1/3

y - (-1) = (1/3)x - 0 ---> y = (1/3)x - 1

5 0
3 years ago
John has $6 to buy school supplies. He buys 6 notebooks that are $0.52 each. He spends the remaining money buying erasers that a
Anuta_ua [19.1K]
John bought 18 erasers.



Explanation: He has $6.00

He spends $3.12 on notebooks
Then you do $6.00 - $3.12 and you get $2.88

If it’s ¢16 per eraser and he has no money left over after buying erasers than you would divide $2.88 by $0.16 which turns into 288 divided by 16 which comes out to 18.

Therefor John bought 18 erasers.
5 0
3 years ago
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