Someone please answer 2.1 ( x + 5 ) = 7

2 answers:

5 0

Since we have the 2.1 next to the parenthesis, we need to first distribute.

2.1 * x & 2.1 * 5

2.1x + 10.5

Then we take that and add the equals seven to the problem to move onto the next step.

2.1x + 10.5 = 7

We must get the 2.1x alone, therefore subtracting the 10.5 as it will also be subtracted on the other side as well.

2.1x + 10.5 = 7
- 10.5 -10.5

2.1x = -3.5

To get the x alone, we must divide both sides by 2.1, therefore removing the 2.1 from the x.

2.1x = -3.5
/2.1 /2.1

x = 1.66666666667

Hope this helped!

- Kat

sp2606 [1]3 years ago

3 0

When we solve the L.H.S
2.1x+10.5=7
2.1x=7-10.5
2.1x=-3.5
x=3.5/2.1
x=3.09(approx.)

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Determine if (3, 7) is a Solution or not Solution to the linear system.

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Answer:

y = 2x + 1 --> linear

y = -4x + 7 --> non-linear

Not a solution for linear system.

Step-by-step explanation:

for (a), y = 2x+1, substitute the x and y values. keep in mind, that in a linear pair, (x, y). So, for the first equation you get:

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3 years ago

A triangle has two sides of length 3 and 15. What is the smallest possible whole-number length for the third side?

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help with this pick one of the 3 equations at the top then answer the questions about the one you pick giving 98 points

Rainbow [258]

The equation I picked was x^2+5x-6=3

1. the parabola opens up as the leading coefficient is a positive.

2. to find the vertex to find the x value
-5/2(1)= -5/2 (-2 1/2) (-2.5)
to find the y value of the vertex substitie the x value into the equation
(-2 1/2)^2+5(-2 1/2)-6=3
6 1/4 - 12 1/2 -9 = y
-15 1/4 = y
y = -15 1/4 (-15.25)

(-2.5, 15.25) , (-2 1/2, -15 1/4)

3. the y intercept can be found by substituting the X's with 0's
x^2+5x-6=3
first move the terms to the left
x^2+5x-9=y
(0)^2+5(0)-9=y
0+9=y
9=y
y=9

the y intercept is 9 (0,9)

4. b^2-4ac
5^2-4(1)(-9)
=25+36
=61
61 is greater than 0 so this means there are 2 real solutions.

5.
$x = \frac{ - 5 + - \sqrt{5^{2} - 4(1)( - 9) } }{2(1)}$
$x - = \frac{ - 5 + - \sqrt{61} }{2}$
$x = \frac{ - 5 + \sqrt{61} }{2} \: or \: x = \frac{ - 5 + \sqrt{61} }{2}$
the +- next to each other is meant to be plus or minus

6. to find three other points pick any x value and substitute that into the equation

y=(2)^2+5(2)-9
y=4+10-9
y=5

(2,5)

y=(3)^2+5(3)-9
y=9+15-9
y=15

(3,15)

y=(4)^2+5(4)-9
y=16+20-9
y=27

(4,27)

I hope this helps, brainliest?

7 0

3 years ago

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