MATHEMATICS HIGH SCHOOL

a + b  +c = 10

a + b - c = 3

 find the value of

a + b + 3c

Answers

Answer 1
Answer: ok if you look at the first to equations carefully you will see that 2 things have changed between the 2. the "+c" is now "-c" and the "10" is now "3"

if we think about it you will see that c=7. well how do we know. when c or 7 was taken away from the problem it left you with 3 

so that means a+b=3

we dont need to know what the exat value of a or b is.

so a+b +3c
      (3) + 3(7)
       3   +  21
         24

a+b+3c=24

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Negative six over seven minus three over five ( symplify)

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-6/(7-3/5)=-6/(4/5)=-6 times 5/4= -30/4= -15/2 final answer.

Based on the diagram, which statement is NOT true

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Answer:

Where's the diagram?.....

Plz help math homework​

Answers

Answer:

36

Step-by-step explanation:

Answer:

36

Step-by-step explanation:

2⋅2⋅3⋅3=36

A taut string of length 10 inches is plucked at the center. The vibration travels along the string at a constant rate of c inches per millisecond in both directions. If x represents the position on the string from the left-most end, so that 0≤x≤10, which of the following equations can be used to find the location x of the vibration after 0.3 milliseconds? A. | x -5 | =0. 3 B. ∣cx−5∣=0.3 C. | x -0.3 | = 5 D. | x - 10 | =0.3c

Answers

Answer:

The correct option is

A. \ (1)/(c) * \left | x - 5 \right | = 0.3

Step-by-step explanation:

The parameters given are;

The length of the string = 10 inches

The speed or rate of travel of the wave = c inches per millisecond

The position on the string from the left-most end = x

The time duration of motion of the vibration to reach x= 0.3 milliseconds

The distance covered = Speed × Time = c×0.3

Given that the string is plucked at the middle, with the vibration travelling in both directions, the point after 0.3 millisecond is x where we have;

The location on the string where it is plucked = center of the string = 10/2 = 5 inches

Distance from point of the string being plucked (the center of the string) to the left-most end = 5 inches

Therefore, on the left side of the center of the string we have;

The distance from the location of the vibration x (measured from the left most end) to the center of the string = 5 - x = -(x -5)

On the right side of the center, the distance from x is -(5 - x) = x - 5

Therefore, the the equation that can be used to find the location of the vibration after 0.3 milliseconds is (1)/(c) * \left | x - 5 \right | = 0.3 or \left | x - 5 \right | = 0.3 * c which gives the correct option as A

2 times 12 minus 14 divided by 2 = ?

Answers

2*12- (14)/(2)

2*12=24

24- (14)/(2)

(14)/(2) =7

24-17=7

- - Final answer: 7

Answer:

This Would Equal 5!

Step-by-step explanation:

2*12= 24

Then, 24-14=10

Finally, 10/2=5

Solve it by substitution method:- 5x - 6y=-9 and 3x + 4y= 25

Answers

\left\{\begin{array}{ccc}-5x-6y=-9&/\cdot2\n3x+4y=25&/\cdot3\end{array}\right\n+\left\{\begin{array}{ccc}-10x-12y=-18\n9x+12y=75\end{array}\right\n------------\n.\ \ \ \ \ \ \ -x=57\n.\ \ \ \ \ \ \ \ \ x=-57\n\n3\cdot(-57)+4y=25\n-171+4y=25\n4y=25+171\n4y=196\ \ \ \ /:4\ny=49\n\nSolution:x=-57;\ y=49.
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