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adoni [48]
3 years ago
8

What operation makes the statement true; 18 __ (-20) =-2

Mathematics
2 answers:
Finger [1]3 years ago
6 0

Answer:

\huge\boxed{\text{+}}

Step-by-step explanation:

To make this statement true, we want to make it so that when -20 is "<em>something</em>'d" to 18, we get -2.

Let's try all the common operators first - add, subtract, multiply, divide.

Let's try add.

If we put a plus sign there:

18 + (-20) = -2

Adding a negative is the same as subtracting a positive.

18-20=-2

This is true! 18 - 20 is indeed -2. This means + is the right operator.

For fun, let me briefly go over what happens with all the other operators.

Subtract:

18 - (-20) = -2\\\\18+20=-2\\\\28 \neq -2

Multiply:

18 \cdot (-20) = -2\\\\-360 \neq -2

Divide:

18 \div (-20) = -2\\\\-0.9 \neq -2

Hope this helped!

8090 [49]3 years ago
5 0

Answer:

18-20=-2

Step-by-step explanation:

18-20=-2

18+(-20)=-2

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2. Consider the function, f(x)=x^3+x^2-9x-9
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The intercepts of the graph are:

x-axis interception: \left(-1,\:0\right),\:\left(-3,\:0\right),\:\left(3,\:0\right).

y-axis interception: \left(0,\:-9\right).

See the graph of the function f(x)=x^3+x^2-9x-9  in the attached image.

<h3>Constructing a graph</h3>

For constructing a graph we have the following steps:

  • Determine the range of values for x of your graph.

For this exercise, for example, we can define a range -4<x<4.  In others words, the values of x will be in this interval.

  • Determine the points

Replace these x-values in the given equation. For example:

When x=-4, we will have: \left(-4\right)^3+\left(-4\right)^2-9\left(-4\right)-9=-21.  Do this for the all x-values of your ranges.

See the results for this step in the attached table.

  • Draw the graph

Mark the points <u>x</u> and<u> y</u> that you found in the last step. After that, connect the dots to draw the graph.

The attached image shows the graph for the given function.

<h3>Find the x- and y-intercepts</h3>

The intercepts are points that crosses the axes of your plot. From your graph is possible to see:

x-axis interception points (y=f(x)=0)  are: \left(-1,\:0\right),\:\left(-3,\:0\right),\:\left(3,\:0\right).

y-axis interception point (x=0) is: \left(0,\:-9\right).

Learn more about intercepts of the graph here:

brainly.com/question/4504979

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2 years ago
Solve the quadratic equation algebraically 5-x&lt;2(x-3)+5
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Answer:

x>2

Step-by-step explanation:

5-x<2(x-3)+5

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2 years ago
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Tpy6a [65]

Answer:

I think it's -14

Step-by-step explanation:

x = 0 so the x won't be included but

-2 • x = -2x

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