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2 years ago

What is the value of p if 2p = 7

Mathematics

2 answers:

kupik [55]2 years ago

4 0

Answer:

p = 5

Step-by-step explanation:

think of it like this:

2 + p = 7

They just want you to find what number can replace the letter so the equation makes sense.

Scrat [10]2 years ago

3 0

You can find the value of p by dividing both sides of the equation by 2. Resulting in 3.5 as the answer

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Find the value of x in the triangle shown below

wolverine [178]

Answer:

Step-by-step explanation:

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2 years ago

Explain why one half times two equals one whole

djverab [1.8K]

Two halfs equal one whole. think of it like this, an orange cut in half leaves you with two halfs, put them together and you have a whole. simple. multiplying by 2 just means adding a number two times.
1 half plus one half= 2halves= 1 whole
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2 years ago

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2365 books were donated to an elementary school. if 5 classrooms shared the books equally, how many books did each class receive

Vadim26 [7]

Answer:

473 books to each class

Step-by-step explanation:

2365÷5=473

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2 years ago

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If 9/a = 7/a², then a=?

Jobisdone [24]

Answer:

x = 7/9

Step-by-step explanation:

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2 years ago

Apply Crammer's Rule to find the solution to the following quations .2x + 3y = 1, 3x + y = 5

Bond [772]

Answer:

The solution to the equation system given is:

<u>x = 2</u>
<u>y = -1</u>

Step-by-step explanation:

First, we must know the equations given:

2x + 3y = 1
3x + y = 5

Following Crammer's Rule, we have the matrix form:

$\left[\begin{array}{ccc}2&3\\3&1\end{array}\right] =\left[\begin{array}{ccc}x\\y\end{array}\right] = \left[\begin{array}{ccc}1\\5\end{array}\right]$

Now we solve using the determinants:

$x=\frac{\left[\begin{array}{ccc}1&3\\5&1\end{array}\right]}{\left[\begin{array}{ccc}2&3\\3&1\end{array}\right] } =\frac{(1*1)-(5*3)}{(2*1)-(3*3)} = \frac{1-15}{2-9} =\frac{-14}{-7} = 2$

$y=\frac{\left[\begin{array}{ccc}2&1\\3&5\end{array}\right]}{\left[\begin{array}{ccc}2&3\\3&1\end{array}\right] } =\frac{(2*5)-(3*1)}{(2*1)-(3*3)}=\frac{10-3}{2-9} =\frac{7}{-7}=-1$

Now, we can find the answer which is x= 2 and y= -1, we can replace these values in the equation to confirm the results are right, with the first equation:

2x + 3y = 1
2(2) + 3(-1)= 1
4 - 3 = 1
1 = 1

And, with the second equation:

3x + y = 5
3(2) + (-1) = 5
6 - 1 = 5
5 = 5

4 0

2 years ago