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EastWind [94]
3 years ago
12

The length of a rectangle is 2 more than twice the width. The area of the

Mathematics
1 answer:
vlada-n [284]3 years ago
8 0

Answer: w=5 , L= 2+2(5)=12

Step-by-step explanation:

L=2+2W

A= 60

LxW=60, now we will replace the L

(2+2W)(W)=60   we multiply

2w^2+2w=60

2w^2+2w-60=0  we divide by 2 the equation so we can work easier

w^2+w-30=0

find out w using the quadratic equation

we will get 2 solution,

w=5 and another solution is -6, which is not valid, as the side can not be negative

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How many kilograms are equal to 3,200 grams?
oksian1 [2.3K]

Answer:

3.2

Step-by-step explanation:

1000 grams in a kilogram

3200/1000=3.2

5 0
3 years ago
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A hairdryer transfers 36,000J in one minute, what is the power rating of the hairdryer?
Verdich [7]

Answer:

1. 600 watts

2. 35640 J

3. 55%

4. 20 J

5. The cost of running the fire is 8p.

Step-by-step explanation:

1. Energy = 36 000 J , t = 1 minute = 60 seconds

Power = \frac{energy}{time}

           = \frac{36000}{60}

          = 600 watts

2. Power = \frac{work done}{time}

⇒ work done = Power × time

                      = 99 × 360

                      = 35640 J

3. Efficiency = (Output / Input) × 100

                    = \frac{55}{100} × 100

                    = 55%

4. Work done = Force × distance

                      = 5 × 4

                      = 20 J

5. Given that 1 KWh cost 2p, Power = 4 KW and time = 4 hours.

  Power = \frac{energy}{time}

Energy = Power × time

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The cost of running the fire = \frac{16}{2}

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3 0
3 years ago
I am a 2 digit number the sum of my digits is 12. the ones digit is twice the tens digit? who am i?
Bas_tet [7]

Answer:

84

Step-by-step explanation:

let a be the 1's digit and b the 10's digit, then

a = 2b ← twice the 10's digit, thus

sum = 2b + b = 12, that is

3b = 12 ( divide both sides by 3 )

b = 4

and a = 2b = 2 × 4 = 8

The 2 digit number is 84

5 0
3 years ago
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attashe74 [19]
The correct answer for each is
a= 390.8
b= 136.8
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alexandr1967 [171]

Answer:

76 percent

Step-by-step explanation:


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