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jekas [21]
3 years ago
5

I NEED HELP DESPERATELY

Mathematics
1 answer:
Inessa [10]3 years ago
6 0

Answer:

Yvette cleared 10 large driveways

Step-by-step explanation:

small driveway = x

big driveway = y

x+y = 25

15x + 25y = 475

y = 25-x

15x + 25(25-x) = 475

-10x + 625 = 475

10x = 150

x= 15

15 + y = 25

y =10

10 large driveways, 1 5 small driveways

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What is the perimeter of the rectangle, if the formula for perimeter is Prectangle = 21 + 2w?
vova2212 [387]
The answer is D, 30cm.
If you do 6+6+9+9 (to find the perimeter) you get your answer.
7 0
3 years ago
What’s 100+100 I’ll make brainliest
eduard

Answer:its 200

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
What is the value of k, so that 3x²+7x+6-k=0 has one root equal to zero? <br>​
djverab [1.8K]

k = 13  is the value of k in quartic equation.

What does the term "quartic equation" mean?

An equation of the fourth degree, often known as a quartic equation, is one that reduces a quartic polynomial to zero. in which a 0. A quartic function's derivative is a cubic function.

Let α = 7x

     β = 6x

α + β =  7x + 6x  = k/3 ............1

13x = k/3

   αβ  = 7x  ×  6x = 14/3

               42x²  = 14/3

                   x²  = 14/3 × 42

                   x²  = 1/9

                   x = 1/3

now putting value of x in 1

7/3 + 6/3 = k/3

1/3( 7 + 6 )= k/3

    k = 13

Learn more about quartic equation

brainly.com/question/28593533

#SPJ9

3 0
1 year ago
The ranger of the function x2+2x-8is allá
allsm [11]

Answer:

\mathrm{Range\:of\:}x^2+2x-8:\quad \begin{bmatrix}\mathrm{Solution:}\:&\:f\left(x\right)\ge \:-9\:\\ \:\mathrm{Interval\:Notation:}&\:[-9,\:\infty \:)\end{bmatrix}

Step-by-step explanation:

As the function is

x^{2} +2x-8

As we know that domain is the set of input values for which the function is defined.

Therefore,

\mathrm{Domain\:of\:}\:x^2+2x-8\::\quad \begin{bmatrix}\mathrm{Solution:}\:&\:-\infty \:

And range is defined as:

The set of the dependent variable for which the function is defined.

As

\mathrm{For\:a\:parabola}\:ax^2+bx+c\:\mathrm{with\:Vertex}\:\left(x_v,\:y_v\right)

\mathrm{If}\:a

\mathrm{If}\:a>0\:\mathrm{the\:range\:is}\:f\left(x\right)\ge \:y_v

a=1,\:\mathrm{Vertex}\:\left(x_v,\:y_v\right)=\left(-1,\:-9\right)

f\left(x\right)\ge \:-9

Therefore,

\mathrm{Range\:of\:}x^2+2x-8:\quad \begin{bmatrix}\mathrm{Solution:}\:&\:f\left(x\right)\ge \:-9\:\\ \:\mathrm{Interval\:Notation:}&\:[-9,\:\infty \:)\end{bmatrix}

The graph is also attached below.

Keywords: graph, domain, range

Learn more about domain and range from brainly.com/question/13856645

#learnwithBrainly

8 0
3 years ago
Work out 4/5 - 1/2 :):):)
zalisa [80]
3/10 is the answer
 i am not sure if the answer is wrong i am sorry
8 0
3 years ago
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