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3 years ago

Solve for the following equation x^2+9x+14=0

Mathematics

1 answer:

sergejj [24]3 years ago

5 0

Answer:

R= {-7,-2}

Step-by-step explanation:

divide 14 into 2 and 7 because 2x7=14
write the equation as a multiplication of (x+7) and(x+2) =0
for the result to equal zero. at least one of the factors must equal zero, therefore we get two solutions

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Answer:20 milkshakes

Step-by-step explanation: 80 x 25% =20

25% or 1/4 of 80 is 20 if that makes sense to you.

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3 years ago

Which of the following represents a weak positive correlation? And explain.

Soloha48 [4]

Answer:

R= 0.2
2

Step-by-step explanation:

explaining the answer to 1

I'll explain everything so you understand.

The correlation coefficient tells us about the strength of the relationship between the variables. In other words, it tells us how well the data fits on the line of best fit.

So, the closer the points lie on the line of best fit the stronger the relationship and correlation.

The further the points lie from the line of best fit, the weaker the correlation

It is important to note that the correlation coefficient (r) always lies between -1 and 1.

So, the closer the value of r lies to -1 or 1 the stronger the relationship between the variables.

The closer the value of r is to 0 the weaker the relationship between the variables and the weaker the correlation.

explaining the answer to 2

the correlation coefficient (r) always lies between -1 and 1 so it can't be 2.

Hope this helps.

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3 years ago

The perimeter of a rectangle is 72 cm. The length is 3 more than twice the width What

solmaris [256]

<h3>Solution</h3>

Given :-

Perimeter of rectangle = 72 cm
The length is 3 more than twice the width.

Find :-

Dimensions of rectangle

<h3 /><h3>Explantion</h3>

Using Formula

$\boxed{\underline{\tt{\red{\:(perimeter_{rectang}\:=\:2\times (Length+Width)}}}}$

Let,

Length of Rectangle = x cm
Breadth of Rectangle = y cm

According to question,

==> perimeter of Rectangle = 72

==> 2(x+y) = 72

==> x + y = 72/2

==> x + y = 36_________________(1)

Again,

==> x = 2y + 3

==> x - 2y = 3__________________(2)

Subtract equ(1) & equ(2)

==> y + 2y = 36 - 3

==> 3y = 33

==> y = 33/3

==> y = 11

keep in equ(1)

==> x - 2×11 = 3

==> x = 3 + 22

==> x = 25

<h3>Hence</h3>

Length of Rectangle = 25 cm
Width of Rectangle = 11 cm

<h3 />

7 0

3 years ago