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2 years ago

Hey guys- need help in this one

Mathematics

2 answers:

oksano4ka [1.4K]2 years ago

8 0

Answer:

Step-by-step explanation:

$x=5+i\sqrt{7} , y = 5-i\sqrt{7}\\ x^2-2xy+y^2=(x-y)^2\\ (x-y)^2=(2i\sqrt{7} )^2\\4.i^2.7\\-28$

Galina-37 [17]2 years ago

7 0

Answer:

Step-by-step explanation:

given x = 5 + i $\sqrt{7}$ then y = 5 - i $\sqrt{7}$

x² - 2xy + y² ← is a perfect square

= (x - y)² ← substitute values for x and y

= (5 + i $\sqrt{7}$ - (5 - i $\sqrt{7}$ )²

= (5 + i $\sqrt{7}$ - 5 + i $\sqrt{7}$ )²

= (2i $\sqrt{7}$ )²

= 2² × i² × ( $\sqrt{7}$ )²

= 4 × - 1 × 7

= - 28

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The product of 9 and x is less than or equal to -17

Inessa05 [86]

Answer:

9+x< -17

(make sure there's a line under the less than sign to make it work to)

Step-by-step explanation:

the product of 9 and x describes an addition problem, so it would be 9+x. after you put the less then or equal to sign and then -17.

Hope this helps

6 0

3 years ago

Solve -2x + 6 = -20.

scoray [572]

-2x=-20-6 X=-26/-2 x=13

4 0

4 years ago

Read 2 more answers

The Tama, Japan, monorail carries 92,700 riders

Damm [24]

Answer:

The monorail runs 18 hours runs every day.

Step-by-step explanation:

You know that the total number of riders the monorail carry each day is 92700 and the number of riders the monorail carry per hour is 5150.

The rule of three or is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.

A direct proportionality relationship is established between two quantities if:

The greater the quantity in one quantity, the greater the quantity in the other quantity, in the same proportion.
The less quantity in the magnitude corresponds to the less quantity in the other magnitude, in the same proportion.

If the relationship between the magnitudes is direct the direct rule of three must be applied and to solve a direct rule of three, the following formula must be followed:

a ⇒ b

c ⇒ x

Being

$x=\frac{c*b}{a}$

In this case the rule of three can be applied in the following way: if the monorail carries 5,150 passengers in 1 hour, the monorail will transport 92,700 passengers in how many hours?

$amount of hours=\frac{92,700 passengers*1hour}{5,150 passengers}$

amount of hours= 18 hours

So the monorail runs 18 hours runs every day.

8 0

4 years ago

PLS HELP!!!! Pointtssss!! The temperature during a very cold day is

grin007 [14]

The type of polynomial that would best model the data is a cubic polynomial. (Correct choice: D)

<h3>What kind of polynomial does fit best to a set of points?</h3>

In this question we must find a kind of polynomial whose form offers the best approximation to the point set, that is, the least polynomial whose mean square error is reasonable.

In a graphing tool we notice that the least polynomial must be a cubic polynomial, as there is no enough symmetry between (10, 9.37) and (14, 8.79), and the points (6, 3.88), (8, 6.48) and (10, 9.37) exhibits a pseudo-linear behavior.

The type of polynomial that would best model the data is a cubic polynomial. (Correct choice: D)

To learn more on cubic polynomials: brainly.com/question/21691794

#SPJ1

6 0

2 years ago

What is the slope of the line that passes through the points (-4, -9) and (5, 3)

egoroff_w [7]

Answer:

4/3

Step-by-step explanation:

Moving from (-4, -9) to (5, 3), x (the 'run') increases by 9 from -4 to 5, and y (the 'rise') increases by 12 from -9 to +3. Thus, the slope of the line connecting the two points is

m = rise / run = 12/9 = 4/3

It may help to think of the change in x (9) as the horizontal leg of a right triangle and the change in y (12) as the vertical leg. Then

m = (vertical leg length) / (horizontal leg length) = 12/9 = 4/3

5 0

3 years ago