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lakkis [162]
3 years ago
7

W Evaluate the following expressions for x = 2. -9.2(4 – x) -9.2(4 - (2) -9.2(2)

Mathematics
2 answers:
xenn [34]3 years ago
8 0

Answer:

-18.4

Step-by-step explanation:

-9.2(4 – x)

Let x=2

-9.2(4 – 2)

Parentheses first

-9.2(2)

Multiply

-18.4

Fed [463]3 years ago
4 0

Answer:

- 18.4

Step-by-step explanation:

The given expresion is

- 9.2(4 - x)

We want to evaluate this expression for x=2.

We substitute x=2 into the expression.

This means that, we will put 2 wherever we see x in the given expresion.

This will give us:

- 9.2(4 - 2)

Simplify the parenthesis

- 9.2(2)

=  - 18.4

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An equivalent expression with a rational denominator is...
Whitepunk [10]

Given the expression,

(8x-56x^2)/(\sqrt{14x-2})

We will have to rationalize the denominator first. To rationalize the denominator we have to multiply the numerator and denominator both by the square root part of the denominator.

[(8x-56x^2)(\sqrt{14x-2})]/[(\sqrt{14x-2})(\sqrt{14x-2})]

If we have (\sqrt{a})(\sqrt{a}), we will get \sqrt{a^2} by multiplying them. And \sqrt{a^2} = a.

So here in the problem, we will get,

[(8x-56x^2)(\sqrt{14x-2})]/(14x-2)

Now in the numerator we have (8x-56x^2). We can check 8x is common there. we will take out -8x from it, we will get,

-8x(-1+7x)

-8x(7x-1)

And in the denominator we have 14x-2. We can check 2 is common there. If we take out 2 from it we will get,

2(7x-1)

So we can write the expression as

[(-8x)(7x-1)(\sqrt{14x-2})]/[2(7x-1)]

(7x-1) is common to the numerator and denominator both, if we cancel it we will get,

(-8x)(\sqrt{14x-2})/2

We can divide -8 by the denominator, as -8 os divisible by 2. By dividing them we will get,

(-4x)(\sqrt{14x-2})

(-4x)(14x-2)^(1/2)

So we have got the required answer here.

The correct option is the last one.

4 0
3 years ago
If y varies directly as x and y=60 when x=12, find y if x=35
Drupady [299]

Answer: y=175

Step-by-step explanation: y&x

y=kx

(Where k is a constant)

When y=60,x=12...we have

60=12k

Divide both side by 12

12k/12=60/12

k=5

Equation becomes y=5k

Finding y when x=35

y=5(35)

y=175

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3 years ago
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3 years ago
If 8 is subtracted from 7 times a number the result is 34
djverab [1.8K]
7x - 8 = 34

Solving:

7x = 34 + 8
7x = 42
x = 6

Hope this helps!
5 0
3 years ago
Math PT Question 19 Which of the following is the correct equation for the trend line in the scatter plot ?
ki77a [65]

Using the points where the blue line crosses the X and Y axis:

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8 0
3 years ago
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