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grigory [225]
3 years ago
5

The sum of 5 and 8 times a number is 45 Which of the following equations below can be used to find the unknown number

Mathematics
1 answer:
Ulleksa [173]3 years ago
5 0
The answer to this is C
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Given the exponential function <img src="https://tex.z-dn.net/?f=f%28x%29%20%3D%209%283%29%5Ex" id="TexFormula1" title="f(x) = 9
RSB [31]

Answer:

f(-1) = 3

General Formulas and Concepts;

<u>Pre-Alg</u>

  • Order of Operations: BPEMDAS

Step-by-step explanation:

<u>Step 1: Define</u>

f(x) = 9(3)ˣ

x = -1

<u>Step 2: Solve</u>

  1. Substitute:                    f(-1) = 9(3)⁻¹
  2. Evaluate:                       f(-1) = 9(1/3)
  3. Multiply:                        f(-1) = 9/3
  4. Divide:                           f(-1) = 3
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3 years ago
Re-write the quadratic function below in Standard Form<br> y=5(x + 1)^2+9
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Answer:

y = 5x^2+10x +14

Step-by-step explanation:

y = 5(x+1)^2+9

= 5(x^2+2x+1)+9

= 5x^2+10x +14

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3 years ago
What is the mean absolute deviation of $29 $58 $15 $129 $75 $22
Vika [28.1K]

Answer:

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Insert data and it will calculate the (MAD).

7 0
3 years ago
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Solve the system of linear equations by substitution.<br> 3x + y = -9<br> y=5x+7
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Answer:

The solution is x = -2, y = -3

Step-by-step explanation:

Let's start with the equation 3x + y = -9

Substitute the y for 5x+7 seen in the second equation

Now you have 3x + (5x+7) = -9

Lets solve:

Let's add the x's

Now we have 8x + 7 = -9

Substracy seven from each side

Now we have 8x = -16

Now let's divide 8 on each side

Now we have x = -2

Now lets plug in -2 to the second equation

The second equation is y = 5x+7

When we plug in -2 we get y=5(-2)+7

We multiply

We now have y = -10+7

Add

y = -3

The solution is x = -2, y = -3

8 0
3 years ago
Which type of triangle will always have exactly 1-fold reflectional symmetry?
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Its <span>isosceles triangle</span>
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