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3 years ago

Please help me !!! You must show work below .

Mathematics

1 answer:

d1i1m1o1n [39]3 years ago

3 0

You just add them :)
2x+7x+3y-3y=-5+9
3y and -3y is 0 which means this equals to 9x=4, so B

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Solve −2x2 +3x − 9 = 0.

Dmitry_Shevchenko [17]

I assume you are asking to solve:

-2x^2 + 3x - 9 = 0

So first, this equation does not have real roots.

It only has 2 complex roots.

The roots are:

3/4 * (1-i√7) and 3/4 * (1+i√7)

8 0

3 years ago

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FinnZ [79.3K]

Write the area I guess ex. 14 = 6t + 6

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3 years ago

A submarine is descending to examine the seafloor 2,100 feet below the surface. It took the submarine 8.75 hours to reach the se

marshall27 [118]

Answer:

240 feet per hour

Step-by-step explanation:

Given that:

Submarine is descending for examining the sea floor.

Distance of sea floor from the surface = 2100 feet

Time taken for the descend = 8.75 hours

To find:

The rate of descent in feet per hour = ?

Solution:

Here, we are given the distance traveled in feet and the time taken to travel that distance in hours.

And we have to find nothing but the speed of the submarine.

First of all, let us have a look at the relationship among speed, distance and time.

$Speed = \dfrac{Distance}{Time}$

Putting the values of distance and time.

$Speed = \dfrac{2100}{8.75}\\\Rightarrow Speed = \bold{240\ feet/hr}$

7 0

3 years ago

Use the method of completing the square to transform the quadratic equation into the equation form (x – p)2 = q.

oee [108]

X^2-12x-9=0
Add 9 to both sides
x^2-12x=9
Add (b/2)^2 to both sides
x^2-12x+36=45
Factor
(x-6)^2=45
So C is the answer

8 0

4 years ago

Write the slope-intercept equation of a line parallel to y = 3x + 2 that

AURORKA [14]

Parallel lines have the same slope, in this case 3.

To find the y intercept we plug in the points (2,1) into y=mx+b, with 2 being x and 1 being y.

1=3(2) + b
Solve this and you get -5 as the y intercept.

The equation is y=3x-5

8 0

3 years ago