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algol [13]
3 years ago
13

If (x+3)+3(x-1)=20, what is the value of x

Mathematics
1 answer:
castortr0y [4]3 years ago
8 0
1(x + 3) + 3(x - 1) = 20
1(x) + 1(3) + 3(x) - 3(1) = 20
               x + 3 + 3x - 3 = 20
               x + 3x + 3 - 3 = 20
                                4x = 20
                                 4      4
                                  x = 5
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Rewrite to the algebraic form The product of x and 4.​
guapka [62]

Answer:

4x

Step-by-step explanation:

When multiplying a number by a variable the number is written first and then the variable. It can be represented like this: 4(x). If you simplify that you get 4x.

3 0
3 years ago
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A car with an initial cost of $26,500 depreciates at a rate of 7.5% per year. Write the function that models this situation. The
solniwko [45]

Answer:

f(x) = 26500 * (0.925)^x

It will take 7 years

Step-by-step explanation:

A car with an initial cost of $26,500 depreciates at a rate of 7.5% per year. Write the function that models this situation. Then use your formula to determine when the value of the car will be $15,000 to the nearest year.

To find the formula we will use this formula: f(x) = a * b^x. A is our initial value which in this case is $26500. B is how much the value is increasing or decreasing. In this case it is decreasing by 7.5% per year. Since the car value is decreasing we will subtract 0.075 from 1. This will result in the formula being f(x) = 26500 * (0.925)^x. Now to find the value of the car to the nearest year of when the car will be 15000 we plug 15000 into f(x). 15000 = 26500 * (0.925)^x. First we divide both side by 26500 which will make the equation: 0.56603773584=(0.925)^x. Then we will root 0.56603773584 by 0.925. This will result in x being 7.29968 which is approximately 7 years.

4 0
3 years ago
I need help ASAP.... please help....
avanturin [10]

Answer:

(7x-1)(x-3)

Step-by-step explanation:

7x^2 - 22x + 3

The factors have to add to -22, but multiply to equal 3. But since the "a" value has a number on it, you have to use it too.

(7x +/- [n1]) ( x +/- [n2]) = 7x^2 - 22x + 3

Since the two numbers multiply to a positive value, they have to have the same sign. (7x-1) (x-3) works to produce the expression when it's foiled.

3 0
3 years ago
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mariarad [96]
The answer would be 114. I did 3 times 38 and thats what i got. I hope it helps:D This is from your friendly Tolkien fan.
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3 years ago
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Evaluate the numerical expression. 9.6 – 10.8 ÷ 0.6
madreJ [45]

Hi there!

Answer:

<u><em>C.-8.4</em></u>

Step-by-step explanation:

divide by the numbers.

10.8-0.6=18.0=18

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subtract the numbers.

9.6-18=-8.4

=-8.4

Hope this helps!

-Charlie

Have a great day!

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