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4 years ago

Helppp! pleaseeeeee (solving the system of equations)

Mathematics

1 answer:

Nitella [24]4 years ago

7 0

Answer: x = -3

Step-by-step explanation:

Solve for the first variable in one of the equations, then substitute the result into the other equation.

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PLEASE answer this one.. I'm down to last answer.. I wanna sleep

Vinvika [58]

that's correct, what you've put in the boxes. :)

6 0

3 years ago

What is x if f ( x) = 23?

musickatia [10]

In the expression f(x)=23, x is not a variable. f(x) means “a function of x” or “f of x” and is in practice another way of substituting for the variable y, that is, we are saying:

y=23.

That means x is unspecified and could be anything. So on the xy plane, this is a straight horizontal line, 23 units above the x axis. That would be the best way to interpret this, although it is a little ambiguous.

Usually functions of x are expressed in terms of x, such as:

f(x) = x^2

6 0

3 years ago

There are some nickels, dimes, and quarters in a large piggy bank. For every 2 nickels there are 3 dimes. For every 2 dimes ther

rodikova [14]

Answer: a) Number of nickels, dimes, and quarters are 80, 120, 300 respectively.

b) The coins are worth of 91 dollars i.e. $91 in the piggy bank.

Explanation:

Since we have given that

For every 2 nickels there are 3 dimes ,

So, their ratio will be 2:3

and for every 2 dimes there are 5 quarters.\,

So, their ratio will be 2:5

Now, we'll first find the ratio of nickles to dimes to quarters i.e.

Nickle Dimes Quarters

2 3

2 5

So, it becomes ,

Nickle : Dimes : Quarters

2×2 : 3×2 : 3×5

4 : 6 : 15

Now, let the number of nickle be 4x

Let the number of dimes be 6x

Let the number of quarters be 15x

According to question,

$4x+6x+15x=500\\\\25x=500\\\\x=\frac{500}{25}=20$

So, number of nickels is given by

$4x=4\times 20=80$

Number of dimes is given by

$6x=4\times 20=120$

Number of quarters is given by

$15x=4\times 20=300$

As we know that

$1\ nickel=5\ cents\\\\1\ dime=10\ cents\\\\1\ quarter=25\ cents$

So, According to our question, we get

$80\times 5+120\times 10+300\times 25=400+1200+7500=9100\ cents\\\\1\ cent=0.01\ dollar\\\\9100\ cents=9100\times 0.01\ dollars=91\ dollars.$

Hence,

a) Number of nickels, dimes, and quarters are 80, 120, 300 respectively.

b) the coins are worth of 91 dollars i.e. $91 in the piggy bank.

7 0

3 years ago

What’s the answer please help if you see this thank you?

alukav5142 [94]

Answer:

Step-by-step explanation:

8x6=48

3x4=12

48+12=60

6 0

3 years ago

Which of the following expressions is a factor of the polynomial x^2 + 3/2x -1

yanalaym [24]

$x^2+\dfrac{3}{2}x-1=x^2-\dfrac{1}{2}x+2x-1=x\left(x-\dfrac{1}{2}\right)+2\left(x-\dfrac{1}{2}\right)\\\\=\left(x-\dfrac{1}{2}\right)(x+2)\\\\Answer:\ x-\dfrac{1}{2}$

5 0

3 years ago

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