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3 years ago

12

Mathematics

2 answers:

yarga [219]3 years ago

7 0

Answer:

D - 4(y x y) + 2

Step-by-step explanation:

(y x y) + y2

4 x y2 = 4y2

which gives you 4y2 + 2

muminat3 years ago

4 0

D is the answer hope this helps

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-72 by 8 A) -9 B) -8 C) 7 D) 8

monitta

Hi there! :) :D

Answer:

A. -9

*The answer must have a negative sign.*

Step-by-step explanation:

Lesson: Dividing integers

First, you divide by the numbers from left to right.

$72/8=9$

It change positive to negative sign.

$72/9=8$

Then, you can also multiply by the numbers from left to right.

$9*8=72$

$8*9=72$

Final answer is -9

Hope this helps!

Have a nice day! :)

-Charlie

Thank you so much! :)

8 0

3 years ago

Read 2 more answers

. If one of the zeroes of the quadratic polynomial (k-1) x2 +k x +1 is -3 then what is the value of k?

KATRIN_1 [288]

Answer:

k = 1¹/₃

Step-by-step explanation:

Comparing (k-1)x² + kx + 1 with ax + bx + c where α, β be the zeroes of the quadratic equation, then

α + β = -b/a = -k/(k - 1) and αβ = c/a = 1/(k - 1)

Since one of the zeros is -3, β = -3

So,

α + β = -k/(k - 1)

α + (-3) = -k/(k - 1)

α - 3 = -k/(k - 1) (1)

and

αβ = 1/(k - 1)

-3α = 1/(k - 1) (2)

From (1), α = 3 - k/(k - 1) (3)

Substituting equation (3) into (2), we have

-3α = 1/(k - 1)

-3[3 - k/(k - 1)] = 1/(k - 1)

-9 + 3k/(k - 1) = 1/(k - 1)

-9 = 1/(k - 1) - 3k/(k - 1)

-9 = (1 - 3k)/(k - 1)

cross-multiplying, we have

-9(k - 1) = 1 - 3k

expanding the brackets, we have

-9k + 9 = 1 - 3k

collecting like terms, we have

-9k + 3k = 1 - 9

-6k = -8

dividing through by -6, we have

k = -8/-6

k = 4/3

k = 1¹/₃

7 0

3 years ago

A coffee shop needs to purchase custom cups. Company C charges a flat fee of $155 plus $15 perrl cup. Company D does not have a

bezimeni [28]

Answer:

11 cups

Step-by-step explanation:

Not really a method just started at 10 and then realised deal d was better so go up by one so 11 and c worked out better as I timed 30 by 11 and 15 by 1 + the flat fee.

8 0

4 years ago

Can anyone help please!!!

masha68 [24]

Answer:

There is an answer for this asked by someone else

Step-by-step explanation:

4 0

3 years ago

a boat is traveling east across a river that is 112 meters wide at 8 meters per second. if the river has a northwest current of

OLEGan [10]

<h3>given:</h3>

boat speed= 8 m/s

river current= 5 m/s

the resultant speed of the motorboat rounded to the nearest 10.

<h3>solution:</h3>

use pythagorean theorem.

let the unknown be "x".

${a}^{2} = {b}^{2} + {c}^{2}$

${c}^{2} = \sqrt{ {a}^{2} + {b}^{2} }$

$x = \sqrt{ {8}^{2} + {5}^{2} }$

$x = \sqrt{64 + 25}$

$x = 9.4 \: m |s$

hence, the resultant speed of the motorboat is 9.4 m/s

3 0

2 years ago

Read 2 more answers