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sweet-ann [11.9K]
3 years ago
7

Hari walked 2 miles in 1/2 hour. True or False: Hari walked 1 mile in 15 minutes. Can you please explain.

Mathematics
2 answers:
Sonja [21]3 years ago
8 0
Well you can make a proportion to see if the values (2 miles in 1/2 hour and 1 mile in 15 minutes) are equal to each other or not. 

**We need to convert 15 minutes into hours --> 15 minutes / 60 minutes = 1/4 hour \frac{2 \text{ miles}}{ \frac{1}{2} \text{ hours} }  =  \frac{1 \text{ mile}}{ \frac{1}{4} \text {hour}}

Cross-multiply...
1/2(1) = 2(1/4) <em>*is this true? </em>
1/2 = 2/4 <em /><em>*if you simplify 2/4 by dividing the numerator and denominator by 2 you get 1/2
</em><em />1/2 = 1/2 <em>**this is correct!</em>

So it is true!


4vir4ik [10]3 years ago
5 0
2 miles = 1/2 hour (a whole hour is 60 mins so half of that is 30 mins) 1 mile = 15 mins (15 mins is half of 30 mins) so yes its true
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Answer:

14637

Step-by-step explanation:

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5 0
3 years ago
Consider the following set of vectors. v1 = 0 0 0 1 , v2 = 0 0 3 1 , v3 = 0 4 3 1 , v4 = 8 4 3 1 Let v1, v2, v3, and v4 be (colu
Alona [7]

Answer:

We have the equation

c_1\left[\begin{array}{c}0\\0\\0\\1\end{array}\right] +c_2\left[\begin{array}{c}0\\0\\3\\1\end{array}\right] +c_3\left[\begin{array}{c}0\\4\\3\\1\end{array}\right] +c_4\left[\begin{array}{c}8\\4\\3\\1\end{array}\right] =\left[\begin{array}{c}0\\0\\0\\0\end{array}\right]

Then, the augmented matrix of the system is

\left[\begin{array}{cccc}0&0&0&8\\0&0&4&4\\0&3&3&3\\1&1&1&1\end{array}\right]

We exchange rows 1 and 4 and rows 2 and 3 and obtain the matrix:

\left[\begin{array}{cccc}1&1&1&1\\0&3&3&3\\0&0&4&4\\0&0&0&8\end{array}\right]

This matrix is in echelon form. Then, now we apply backward substitution:

1.

8c_4=0\\c_4=0

2.

4c_3+4c_4=0\\4c_3+4*0=0\\c_3=0

3.

3c_2+3c_3+3c_4=0\\3c_2+3*0+3*0=0\\c_2=0

4.

c_1+c_2+c_3+c_4=0\\c_1+0+0+0=0\\c_1=0

Then the system has unique solution that is (c_1,c_2c_3,c_4)=(0,0,0,0) and this imply that the vectors v_1,v_2,v_3,v_4 are linear independent.

4 0
3 years ago
I'm having a hard time on this problem. Plz help. Will mark brainliest.
Grace [21]

Answer:

<h2>y = 31</h2>

Step-by-step explanation:

We know: opposite angles in a parallelogram have the same measure.

Therefore we have the equation:

x+y=87+y            <em>subtract y from both sides</em>

x=87

We know: the sum of the angle measures in the triangle is 180°.

Therefore we have the equation:

42+(x+y)+20=180          <em>subtitute x = 87</em>

42+87+y+20=180

149+y=180              <em>subtract 149 from both sides</em>

y=31

7 0
3 years ago
I Need help please I don’t understand this
Otrada [13]

Remember that parentheses come first. Follow PEMDAS

4 0
3 years ago
Hanna shops for socks that cost $2.99 for each pair and blouses that cost $12.99 each. Let x represent the number of pairs of so
m_a_m_a [10]
I believe this is an equation that could help solve your problem 2.99x+12.99y=43.92
8 0
3 years ago
Read 2 more answers
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