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2 years ago

Quickly plz 9th grade math

Mathematics

2 answers:

kozerog [31]2 years ago

4 0

Answer:

The answer is -8.7

Step-by-step explanation:

-5(-2.1) + 4(-4.8)

10.5 + 4(-4.8)

10.5 + (-19.2) = -8.7

Rainbow [258]2 years ago

3 0

Im pretty sure its -8.7

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A circle has a diameter with endpoints at (6, 5) and (8, 5). Write the equation for the circle.

mario62 [17]

Answer:

$(x-7)^2+(y-5)^2=1$

Step-by-step explanation:

The two things that are required to formulate the equation of the circle is the center coordinate and the radius of the circle!

Center of the circle:

The center of the circle always lies at the midpoint of the endpoints of its diameter: Let's call the endpoints A(6,5) and B(8,5).

Using the midpoint formula we'll get:

$(x_m, y_m) = \left(\dfrac{x_1+x_2}{2},\dfrac{y_1+y_2}{2}\right)$

$(x_m, y_m) = \left(\dfrac{6+8}{2},\dfrac{5+5}{2}\right)$

$(x_m, y_m) = (7,5)$

This is the center coordinate of our circle.

Radius:

The radius of the circle is the distance from the center of the circle to any of the endpoints of the diameter (A or B)

We can use the distance formula:

$r = \sqrt{(x_1-x_2)^2+(y_1-y_2)^2}$

$r = \sqrt{(x_1-x_m)^2+(y_1-y_m)^2}$

$r = \sqrt{(6-7)^2+(5-5)^2}$

$r = \sqrt{1^2}$

$r = 1$

Equation of the circle:

The equation is written as:

$(x-a)^2+(y-b)^2=r^2$

here, (a,b) are the center points of the circle

in our case this is $(a,b)=(x_m,y_m)=(7,5)$

and r = 1

$(x-7)^2+(y-5)^2=1^2$

$(x-7)^2+(y-5)^2=1$

This is the equation of the circle!

3 0

2 years ago

Helppppppppp plzzzzzzzzzzz

Leya [2.2K]

The answer is 120.
Needs full space

8 0

2 years ago

Many years ago, the towns of Franklin and Chester agreed to begin posting their populations on signs just outside of their towns

iVinArrow [24]

Answer:

The answer is 9

Step-by-step explanation:

4 0

3 years ago

Read 2 more answers

PLEASE HELP ME ASAP!

maw [93]

Answer:

Yes

Step-by-step explanation:

for pens you are adding 3 each time

for boxes you are adding 1 each time

it is correct because they all have the same unit rate

3/1=3

6/2=3

9/3=3

12/4=3

7 0

2 years ago

PLEASE HELP ME i really need help and please show your work

tester [92]

Since the graph is a straight line, we know that this equation follows some sort of y = mx + b format.

Let's take the points that are on the axes (-4,0) and (0,-3)
use them to find the slope = (0 - (-3))/(-4 - 0) = 3/(-4) = -3/4
this is our m in the general equations above
we now have y = (-3/4)x + b
b is the y-intercept which is where x = 0 we already have that point in (0,-3)

plug the -3 in for b to give as a final answer:
y = (-3/4)x - 3

6 0

3 years ago

Quickly plz 9th grade math ​

Quickly plz 9th grade math