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3 years ago

Study the steps used to solve the equation

Mathematics

1 answer:

svet-max [94.6K]3 years ago

8 0

Answer:

c = 24

Step-by-step explanation:

The given equation is :

$\dfrac{c}{2}-5=7$

Adding both sides by 5 both sides,

$\dfrac{c}{2}-5+5=7+5\\\\\dfrac{c}{2}=12$

Cross multiplying both sides,

$c=2\times 12$

c = 24

So, the value of c is 24.

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1. What's 7/8 as a decimal?

denpristay [2]

Answer:

0.875

Step-by-step explanation:

7/8 as a decimal is 0.875. Another was of thinking of this is the number '7' is 87.5 percent of the number '8.

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3 years ago

Solve the system by substitution. y=2x^2-3x-1 y=x-3

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The answer is B(1,-2). This is the only point where the two lines intercept. & if you plug the numbers into the equations they fit.

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3 years ago

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Select all equations that have two solutions. a x^2=16 b 4x^2=0 c x^2=-16 d 3x+2=14 e x^2-1=24 f (x+8)(x-8)=0

never [62]

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a )

${x}^{2} = 16$

$x = ± \: 4$

Two solutions.

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b )

$4 {x}^{2} = 0$

$x = 0$

One solution .

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c )

${x}^{2} = - 16$

$No \: \: solution.$

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d )

$3x + 2 = 14$

$x = 4$

One solution.

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e )

${x}^{2} - 1 = 24$

${x}^{2} = 25$

$x =± \: 5$

Two solutions.

_________________________________

f )

$(x + 8)(x - 8) = 0$

$x = - 8 \: \: or \: \: x = 8$

Two solutions .

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3 years ago

Two trains leave stations 288 miles apart at the same time and travel towards each other. One train travels at 95 miles per hour

erma4kov [3.2K]

95x=85x+288
You could add 288 to any side, it just shows that they're 288 miles apart.
Let's subtract 85x from both sides.
10x=288
28.8=x
It'll take 28.8 hours for the trains to meet. Let's make sure.
28.8×95
2,736
28.8×85
2,448
2,736-2,448
288
So, they'll meet up after 28.8 miles.

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3 years ago

The data to represent average test scores for a class of 16 students includes an outlier value of 78. If the mean, including the

monitta

Answer:

Given that The data to represent average test scores for a class of 16 students includes an outlier value of 78.

We can find sum of all 16 test scores = 84(16) = 1344

Outlier found = 78

If outlier is removed new sum = 1344-78 = 1266

Number of entries without outlier = 15

New average = 1266/12 =84.4

We find that average of new data increases.

Also whenever we remove outlier std deviation also would be reduced.

Step-by-step explanation:

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3 years ago

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