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Dimas [21]
3 years ago
12

What is the value of x in the equation 4 x plus 8 y equals 40, when y equals 0.8? 4.6 8.4 10 12What is the value of a in the equ

ation 3 a plus b equals 54, when b equals 9? 15 18 21 27What is the value of a in the equation 3 a plus b equals 54, when b equals 9? 15 18 21 27
Mathematics
2 answers:
Mama L [17]3 years ago
8 0

Answer:

1. 8.4 2. 15

Step-by-step explanation:

1. 4x+8y= 40

wen y= 0.8

4x+8×0.8=40

4x=40-8×0.8

4x= 40- 6.4= 33.6

....x= 33.6/4 = 8.4

2. 3a+b= 54

wen b= 9

3a+ 9= 54

3a= 54- 9

3a=45

.....a = 45/3 = 15

pls rate me

12345 [234]3 years ago
7 0

Answer:

a = 15

Step-by-step explanation:

Given

3a + b = 54 ← substitute b = 9

3a + 9 = 54 ( subtract 9 from both sides )

3a = 45 ( divide both sides by 3 )

a = 15

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Rasek [7]

Answer:

1200

Step-by-step explanation:

Since the value they are asking for is in minutes, we need to convert seconds to minutes. We can do that by multiplying 4 and 60, because there are 60 seconds in a minute, and we need to find the value of one minute.  Also because the value they gave is 4. When we do this, we get 240. To get the final answer, we need to multiply 240 and 5, because 240 is the descending rate per minute, and they are asking for 5 minutes. When we do this, we get 1200.

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R value of <br> X=10, 11, 12, 13, 14 y=10, 12, 16, 17, 18<br> What would be the value of x
Ann [662]

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7 0
3 years ago
Please help!
Ganezh [65]

Answer:

The measures of ∠BOC is 25.4° and that of ∠AOB is 15.8°.

Step-by-step explanation:

Given that,

∠AOC = 31°

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∠AOB = 4x-15

As we can seen from the figure that,

∠AOC = ∠AOB + ∠BOC

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x = 7.7

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4 0
3 years ago
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dolphi86 [110]

Answer:

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Step-by-step explanation:

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2 years ago
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Mikaela will invest $2,500 in an account that pays her 7.5% over 2 years. How much interest will she receive? Also, how much wil
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Answer:

i. $375

ii, $2875

Step-by-step explanation:

Given

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rate= 7.5%

time= 2 years

Required,

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Step two:

SI= PRT/100

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SI=37500/100

SI=$375

The simple interest is $375

And the final amount = $2,500 +$375= $2875

5 0
3 years ago
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