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patriot [66]
3 years ago
10

3 people traveled 27 miles total and person number 2 went 6 miles more than person number 1 and person number 3 went 3 miles mor

e than person number 2. Solve problem algebraically
Mathematics
2 answers:
german3 years ago
5 0

Answer : The distance travelled by person 1, person 2 and person 3 is, 4 miles, 10 miles and 13 miles respectively.

Step-by-step explanation :

Let the distance travelled by person number 1 = x miles

Then, the distance travelled by person number 2 = (x+6) miles

And, the distance travelled by person number 3 = (x+6) + 3 miles = (x+9) miles

Total distance travelled by 3 persons = 27 miles

As per question,

x + (x+6) + (x+9) = 27

3x + 15 = 27

3x = 27 - 15

3x = 12

x = 4

The distance travelled by person number 1 = x miles = 4 miles

The distance travelled by person number 2 = (x+6) miles = (4+6) miles = 10 miles

The distance travelled by person number 3 = (x+9) miles = (4+9) miles = 13 miles

gtnhenbr [62]3 years ago
3 0

Answer:

3 miles,9 miles and 15 miles

Step-by-step explanation:

GIVEN: 3 people traveled 27 miles total and person number 2 went 6 miles more than person number 1 and person number 3 went 3 miles more than person number 2.

TO FIND: Solve problem algebraically.

SOLUTION:

Let the distance traveled by person 1 be x

distance traveled by person 2  =x+6

distance traveled by person 3=2x+9

According to the question

Total distance traveled by all =27

x+x+6+2x+9=27\implies4x+15=27

\implies 4x=12

\therefore x=3

first person traveled =3\text{ miles}

Second person traveled =x+6=9\text{ miles}

Third person traveled =2x+9=15\text{ miles}

Hence person number 1,2 and 3 traveled 3 miles,9 miles and 15 miles respectively.

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Answer: \int\limits^a_E {\int\limits^a_E {\int\limits^a_E {xy} } \, dV = 1087.5

Step-by-step explanation: To evaluate the triple integral, first an equation of a plane is needed, since the tetrahedon is a geometric form that occupies a 3 dimensional plane. The region of the integral is in the attachment.

An equation of a plane is found with a point and a normal vector. <u>Normal</u> <u>vector</u> is a perpendicular vector on the plane.

Given the points, determine the vectors:

P = (5,0,0); Q = (0,9,0); R = (0,0,4)

vector PQ = (5,0,0) - (0,9,0) = (5,-9,0)

vector QR = (0,9,0) - (0,0,4) = (0,9,-4)

Knowing that cross product of two vectors will be perpendicular to these vectors, you can use the cross product as normal vector:

n = PQ × QR = \left[\begin{array}{ccc}i&j&k\\5&-9&0\\0&9&-4\end{array}\right]\left[\begin{array}{ccc}i&j\\5&-9\\0&9\end{array}\right]

n = 36i + 0j + 45k - (0k + 0i - 20j)

n = 36i + 20j + 45k

Equation of a plane is generally given by:

a(x-x_{0}) + b(y-y_{0}) + c(z-z_{0}) = 0

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36(x-5) + 20(y-0) + 45(z-0) = 0

The equation is: 36x + 20y + 45z - 180 = 0

Second, in evaluating the triple integral, set limits:

In terms of z:

z = \frac{180-36x-20y}{45}

When z = 0:

y = 9 + \frac{-9x}{5}

When z=0 and y=0:

x = 5

Then, triple integral is:

\int\limits^5_0 {\int\limits {\int\ {xy} \, dz } \, dy } \, dx

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\int\limits^5_0 {\int\limits {\int\ {xyz}  \, dy } \, dx

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<u>The volume of the tetrahedon is 1087.5 cubic units.</u>

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