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galina1969 [7]
3 years ago
6

twelve decreased by twice a number is the same as 8 times the sum of the number plus 4. What is the number

Mathematics
1 answer:
solmaris [256]3 years ago
7 0

The number is 4/5 or 0.8.

let x be the number.

12 - 2x = 8x + 4

-12 -8x   -8x   -4

-10x = -8

-10x\-10 = -8/-10

x = 4/5 or 0.8

        

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four 3 megawatt wind turbines can supply enough electricity to power 3000 homes. How many turbines would be required to power 55
fiasKO [112]

Answer:

The number of turbines is 74

Step-by-step explanation:

* Lets explain how to solve the problem

- Four 3 megawatt wind turbines can supply enough electricity

 to power 3000 homes

∴ The number of turbines is 4

∵ Each turbine give 3 megawatt

∴ The four turbines give ⇒ 4 × 3 = 12 megawatt

- This quantity give enough electricity to power 3000 homes

∴ The number of homes for the 12 megawatt is 3000

- We need to find how many turbines can cover enough electricity

  to power 55,000 homes, so we must to know the quantity of

  electricity that be enough to power 55,000 homes

* <em>Lets use the cross multiplication to solve the problem</em>

∵         megawatt    :     number of homes

                  12          :              3,000

                  ?            :            55,000

- <em>By using cross multiplication</em>

∴ ?=\frac{(55,000)(12)}{3,000}=\frac{660,000}{3000}=220

∴ The enough electricity to power 3000 homes = 220 megawatt

∵ Each turbine gives 3 megawatt

- Find the number of turbines divides the total megawatt by the the

  megawatt of one turbine

∴ The number of turbines = 220 ÷ 3 = 73.3

- If we take 73 only the electricity will not be enough to cover all

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∴ The number of turbines is 74

5 0
3 years ago
What is the opposite of -63
Evgesh-ka [11]

Answer:

63

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
ALGEBRA! NEED HELP!
grigory [225]
The base's length is 8 and it's width is 7, so it's perimeter will be 2\cdot (7+8)=30 . To find the lateral area you shoul multiply this with it's height. So, 30\cdot h=150\\ h=\frac { 150 }{ 30 } \\ h=5 (h is height).

5 0
3 years ago
Help please will mark
Ann [662]
200in^2
The face is made up of 2 squares which have side lengths of 10, 10 times 10 equals 100 and there’s 2 of them which makes 100+100=200in^2
7 0
3 years ago
What will the population of bacteria be if I have 225 bacteria to start and it triples ever hour for 2 hours
VMariaS [17]

225•3=675

675•3=2,025

675+2,025=2700

The answer is 2,700.

Hope this helps!

4 0
3 years ago
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