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4 years ago

What is the value of x in the equation 8 + x = 3?

Mathematics

2 answers:

Vera_Pavlovna [14]4 years ago

5 0

First, subtract 8 on both sides of the equation to get

x = 3-8 = -5.

Therefore, x=-5.

IgorLugansk [536]4 years ago

4 0

Answer:

x = -5

Step-by-step explanation:

8 + x = 3

We need to isolate x so subtract 8 from each side

8 -8+ x = 3-8

x = -5

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Compare 5/12 and 7/12 by comparing them to a benchmark fraction on the number line

aivan3 [116]

Compare it to 1/2 (which is the same as 6/12)

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3 years ago

The senior classes at High School A and High School B planned separate trips to Lake Compounce. The senior class at High School

storchak [24]

Answer:

Number of students in vans =15 and bus =46

Step-by-step explanation:

use variables for the vans and buses

let x= vans and y=buses

Now solve the 2 equations simultaneously

remember to number your equations

6x+7y=412..........1

6x+9y=504.........2

make x the subject of one equation

and label it equation 3

6x=412—7y

$x = \frac{206}{3} - \frac{7y}{6} .............3$

subs 3 into 2

$6( \frac{206}{3} - \frac{7y}{6} ) + 9y = 504$

$412 - 7y + 9y = 504$

$- 7y + 9y = 504 - 412$

$2y = 92$

$y = 46...................4$

subs 4 into 1

$6x + 7(46) = 412$

$6x + 322 = 412$

$6x = 412 - 322$

$6x = 90$

$x = 15$

Therefore there are 15 students in each van and 46 students in each bus.

3 0

3 years ago

An SRS of size 20 is drawn from a population that has a normal distribution. The sample has a mean of 122.5 and a standard devia

Tems11 [23]

Answer:

The value is $\sigma_{\= x} = 1.789$

Step-by-step explanation:

From the question we are told that

The sample size is n = 20

The sample mean is $\= x = 122.5$

The standard deviation is $s = 8$

Generally the standard error of the mean is mathematically represented as

$\sigma_{\= x} = \frac{s}{\sqrt{n} }$

=> $\sigma_{\= x} = \frac{8}{\sqrt{20 } }$

=> $\sigma_{\= x} = 1.789$

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3 years ago

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andreev551 [17]

Answer:

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Step-by-step explanation:

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3 years ago

What is the solution to the system of equations below? y= -4/5 x + and y = –30

Naya [18.7K]

Answer:

$x=37.5$

Step-by-step explanation:

We need to find the solution to the following system of equations:

$y = -\frac{4}{5} x$ and $y=-30$

By plugging the value of 'y' into the first equation we have that:

$-30 = -\frac{4}{5} x$ ⇒ $30=\frac{4}{5} x$

Solving for 'x' we have:

$x=37.5$

So, the solution to the system of equation is: (37.5, -30)

8 0

3 years ago