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Cloud [144]
3 years ago
13

What is the answer to this question I am really having trouble ??

Mathematics
1 answer:
masya89 [10]3 years ago
3 0
<h3>Answer: Choice B</h3><h3>y = x^2 + 7x + 1</h3>

======================================

Proof:

A quick way to confirm that choice B is the only answer is to eliminate the other non-answers.

If you plugged x = 1 into the equation for choice A, you would get

y = -x^2 + 7x + 1

y = -1^2 + 7(1) + 1

y = -1 + 7 + 1

y = 7

We get a result of 7, but we want 9 to be the actual output. So choice A is out.

-----------

Repeat for choice C. Plug in x = 1

y = x^2 - 7x + 1

y = 1^2 - 7(1) + 1

y = 1 - 7 + 1

y = -5

We can eliminate choice C (since again we want a result of y = 9)

-----------

Finally let's check choice D

y = x^2 - 7x - 1

y = 1^2 - 7(1) - 1

y = 1 - 7 - 1

y= -7

so choice D is off the list as well

-----------

The only thing left is choice B, so it must be the answer. It turns out that plugging x = 1 into this equation leads to y = 9 as shown below

y = x^2 + 7x + 1

y = 1^2 + 7(1) + 1

y = 1 + 7 + 1

y = 9

And the same applies to any other x value in the table (eg: plugging in x = 3 leads to y = 31, etc etc).

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Solve the equation for x. 2+34=4(x+5)
ozzi

2+34=4(x+5)

distribute

2+34 = 4x+20

combine like terms

36 = 4x+20

subtract 20 from each side

16 = 4x

divide by 4

4 = x

Answer: x=4

7 0
3 years ago
Read 2 more answers
WILL GIVE BRAINLIEST!! 2) Match the graph with its function. Which is an example of growth/decay?
Neporo4naja [7]

The exponential growth is: f(x) = 15*(1.25)^x

And its graph is the first one.

The exponential decay is: f(x) = 250*(0.87)^x

And its graph is the second one.

<h3>How to identify the exponential equations?</h3>

The general exponential equation is of the form:

y = A*(b)^x

Where A is the initial value and b is the base.

  • If b > 1, then we have an exponential growth.
  • if 1 > b > 0, then we have an exponential decay.

Here the two functions are:

f(x) = 250*(0.87)^x

f(x) = 15*(1.25)^x

As you can see, the base for the first one is smaller than 1, then it is an exponential decay (and it has a decreasing graph, so the graph of this one is the second graph).

For the second function, we have the base b = 1.25, which is larger than 1, so it is an exponential growth, and its graph is an increasing graph, which is the first one.

If you want to learn more about exponential functions:

brainly.com/question/11464095

#SPJ1

6 0
2 years ago
Claire correctly solved the proportion x/4 = 36/16 for x using cross products to get the equation 16x = 144 and then dividing bo
Anna11 [10]

Answer:

The cross product property

Step-by-step explanation:

The cross product property also known as cross multiplication is a method in math that is most of the time used in solving problems involving ratios usually in a big X form across the equal sign between two ratios.

It is done by multiplying the numerator of the left ratio by the denominator of the right with an equal to the multiplication of the numerator of the right ratio by the denominator of the left.

8 0
3 years ago
5/8 * (-65) in simplified form
kow [346]
The answer would be -325/8 but simplify that and u get -40 5/8 hope this helps
6 0
3 years ago
Read 2 more answers
Simplify: 3(2x-y)-(5x+4y-2) <br>Please show steps
il63 [147K]

Answer:

6 x ^2 − 5 x y − 4 y ^2

Step-by-step explanation:

Expand  

( 2 x + y ) (3 x − 4 y )

using the FOIL Method.

Apply the distributive property.

2 x ( 3 x − 4 y ) + y ( 3 x − 4 y )

Apply the distributive property.

2 x ( 3 x )+ 2 x (− 4 y ) + y ( 3x − 4 y )

Apply the distributive property.

2 x ( 3 x ) + 2 x( − 4 y ) + y ( 3 x) + y ( −4 y )

Simplify and combine like terms.

6 x ^2 − 5 x y − 4^ 2

7 0
3 years ago
Read 2 more answers
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