MATHEMATICS MIDDLE SCHOOL

X=5y. y=10x+20

Help please

Answers

Answer 1

Answer: y=10x+20
y=10×5y+20
y=50y+20
-20=50y-y
-20=49y
y=-20/49

Answer 2

Answer:

Answer:

x = -2.04

y = - 0.408

Step-by-step explanation:

this is a solve by substitution problem. you know what x is from the first equation so you plug that into the second equation and solve for y. then when you know y you can plug y back into any equation to find x.

y=10(5y)+20 (substitute x)

y=50y+20 (subtract 50y from both sides)

-49y=20 (divide each side by -49)

y= -0.408

x=5(-0.408) (plug y in)

x= -2.04

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How many times does 5 go in 8

Answers

Once, it goes into eight once.
If it went in there two times you'd have 10, and so on.

Hope this helps.

5+5=10 8-5=3 so 5 can go into 8 1 time, and 3 will be left over.

Hope this helps.

What is the volume of this model

Answers

Let me see if I can help...
First let's split the shape into two rectangles.
Use the formula V = lwh or V = Bh ....
To find the volume of the bottom rectangle we multiply...
V = (4*2) x 1
This gets us 8 in³.
To find the volume of the top triangle we multiply...
V = (2*1) x 2
This gets us 4 in³.
Now just add 8 + 4 and you will get 12 in³.
Hope this helps you.
(If you need any more explanation I'm happy to help you.)

Corinne is 6 years younger than her brother. Which of the following expressions shows the sum of their ages if b represents Corinne's brother's age?A. b − 6
B. 2b − 6
C. 2(b − 6)
D. b ÷ 6

Answers

its b-6 because her brother is B and crinne is 6 yrs youner meaning that its -6 so final answer is B-6

A quadratic equation set equal to zero that has a double root. Explain what this means and describe the quadratic.

Answers

Double roots of a quadratic equation shows that they are same root, and the graph of the quadratic function merely touches the input axis.

What does a double root mean for a quadratic equation?

Let there is a quadratic function as: $y = ax^2 + bx + c$

The input axis is 'x-axis' and the output axis is 'y-axis'

When the output is 0, we get the graph of that function touching the x-axis since the place where y is 0 is only x-axis.

Thus, putting $ax^2 + bx +c = 0$ gives us the values of x for which the graph of the function $y = ax^2 + bx + c$ intersects the x-axis.

These points of interesection are called roots of the quadratic equation.

If the graph only touches the input axis (here x-axis), then both the roots are lying on same point and therefore are of equal measurement.

This is the condition when we call that the considered quadratic equation has double roots.

Let we consider and example of a quadraticfunction which will have double root.

Since (x-3)(x-3) = 0 will give x= 3 two times, that means the roots of the equation (x-3)(x-3) are same, and are equal to 3.

So, $y = (x-3)(x-3) = x^2 -6x +9$ is one such quadraticfunction having double roots, as shown in the image attached below.

Learn more about finding the nature of the roots of a quadratic equation here:

brainly.com/question/24730520

Answer:

Step-by-step explanation: When the left side factors into two linear equations with the same solution, the quadratic equation is said to have a repeated solution. We also call this solution a root of multiplicity 2, or a double root.

Every morning Jim runs for 20 minutes if Jim runs for 9 miles per hour how far does he travel

Answers

First we have to know how much of one hour is 20 min.
To get it, we have to dividie 20min by 60 min (60 min=1hour), so
20:60= $(20)/(60)= (2)/(6)= (1)/(3)$

We know that
$v= (s)/(t)$
where v is velocity, s is distance and t is time
We can modify formula to get

$v= (s)/(t) \n v*t=s$
Now we just have to substitute our data ( t=1/3 and v=9 miles/hour)
s= $(1)/(3)*9$ =3 miles - its the result

One hour is sixty minutes, so if he runs nine miles in one hour and he only runs for twenty minutes than it should be 9/3= 3 miles

The scale drawing represents Kim’s living room. She wants to put new baseboards on the walls of the room. If the scale is 2 cm:1 m and the baseboard costs $4.19 per meter, how much would it cost to put baseboards in Kim’s living room?A. $4.53

B. $79.61

C.$159.22

D. $318.44

THE SCALE DRAWING IS AT THE BOTTOM: