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natulia [17]
3 years ago
6

Which number line shows the graph of -0.7

Mathematics
2 answers:
Elan Coil [88]3 years ago
7 0
Answer is A.
-0.7 is 0.7 units on the left from 0 on number line
hope it helps
GuDViN [60]3 years ago
6 0
The answer is the first one because if you count it, number line 1 has-0.7 graphed.
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(08.07 HC)
andreev551 [17]

Answer:

\textsf{A)} \quad x=-2, \:\:x=\dfrac{5}{2}

\textsf{B)} \quad \left(\dfrac{1}{4},-\dfrac{81}{8}\right)=(0.25,-10.125)

C)  See attachment.

Step-by-step explanation:

Given function:

f(x)=2x^2-x-10

<h3><u>Part A</u></h3>

To factor a <u>quadratic</u> in the form  ax^2+bx+c<em> , </em>find two numbers that multiply to ac and sum to b :

\implies ac=2 \cdot -10=-20

\implies b=-1

Therefore, the two numbers are -5 and 4.

Rewrite b as the sum of these two numbers:

\implies f(x)=2x^2-5x+4x-10

Factor the first two terms and the last two terms separately:

\implies f(x)=x(2x-5)+2(2x-5)

Factor out the common term  (2x - 5):

\implies f(x)=(x+2)(2x-5)

The x-intercepts are when the curve crosses the x-axis, so when y = 0:

\implies (x+2)(2x-5)=0

Therefore:

\implies (x+2)=0 \implies x=-2

\implies (2x-5)=0 \implies x=\dfrac{5}{2}

So the x-intercepts are:

x=-2, \:\:x=\dfrac{5}{2}

<h3><u>Part B</u></h3>

The x-value of the vertex is:

\implies x=\dfrac{-b}{2a}

Therefore, the x-value of the vertex of the given function is:

\implies x=\dfrac{-(-1)}{2(2)}=\dfrac{1}{4}

To find the y-value of the vertex, substitute the found value of x into the function:

\implies f\left(\dfrac{1}{4}\right)=2\left(\dfrac{1}{4}\right)^2-\left(\dfrac{1}{4}\right)-10=-\dfrac{81}{8}

Therefore, the vertex of the function is:

\left(\dfrac{1}{4},-\dfrac{81}{8}\right)=(0.25,-10.125)

<h3><u>Part C</u></h3>

Plot the x-intercepts found in Part A.

Plot the vertex found in Part B.

As the <u>leading coefficient</u> of the function is positive, the parabola will open upwards.  This is confirmed as the vertex is a minimum point.

The axis of symmetry is the <u>x-value</u> of the <u>vertex</u>.  Draw a line at x = ¹/₄ and use this to ensure the drawing of the parabola is <u>symmetrical</u>.

Draw a upwards opening parabola that has a minimum point at the vertex and that passes through the x-intercepts (see attachment).

5 0
2 years ago
Which best models a plan a. floor b. pebble c. jump rope d. stick
Setler79 [48]
Its .A.

hope this helps
3 0
3 years ago
Here is a set of signed numbers order them least to greatest: 7, -3, , -0.8, 0.8, -, -2
Aleksandr [31]

Answer:

-3, -2, -0.8, 0.8, 7

7 0
3 years ago
Read 2 more answers
Please answer each question
Alja [10]

Answer:

1)When subtract you will still get a negative number

4 0
3 years ago
Need help please ASAP
Ostrovityanka [42]

Answer:

D

Step-by-step explanation:

You have 4 chairs originally, added 2 and if you separate the tables you would get T=whatever the number is. i think

4 0
3 years ago
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