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andreev551 [17]
3 years ago
14

Write or draw to explain a way to find each sum: 6+7, 8+4, 2+9

Mathematics
2 answers:
riadik2000 [5.3K]3 years ago
7 0

Step-by-step explanation:

For 6+7, on a number line we have placed a point A on value 6. On moving 7 units in the rightwards direction a point B is marked. That means when we move from 0 to point B, we get the result for 6+7 = 13.

For 8+4, on a number line we have placed a point C on value 8. On moving 4 units in the rightwards direction a point D is marked. That means when we move from 0 to point D, we get the result for 8+4 = 12.

For 2+9, on a number line we have placed a point E on value 2. On moving 9 units in the rightwards direction a point F is marked. That means when we move from 0 to point F, we get the result for 2+9 = 11.



storchak [24]3 years ago
6 0
Draw six dots then a plus sign then draw seven dots and the count them and put an equal sign and however many dots. Doe the same with the other numbers
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Re-write the quadratic function below in Standard Form<br> y= -(x – 8)^2 +4
s2008m [1.1K]

Answer:

y =  -  {(x - 8)}^{2}  + 4 \\  =  - ( {x}^{2}  - 16x + 64) + 4 \\  =  -  {x}^{2}  + 16x - 64 + 4 \\ y=  -  {x}^{2}  + 16x - 60

7 0
3 years ago
The top and bottom margins of a poster 6 cm each, and the side margins are 4 cm each. If the area of the printed material on the
Serga [27]

Answer:

p = 25,20 cm

h = 34,32 cm

A(min) = 864,86 cm²

Step-by-step explanation:

Let call p and h dimensions of a poster, ( length , and height respectively) and x and y  dimensions of the printed area of the poster then

p = x + 8        and      h = y + 12

Printed area = A(p) = 384 cm²     and   A(p) = x*y     ⇒ y = A(p)/x

y = 384 / x

Poster area  =  A(t) = ( x + 8 ) * ( y + 12 ) ⇒ A(t) =  ( x + 8 ) * [( 384/x ) + 12 ]

A(t)  =  384 + 12x + 3072/x + 96      A(t) = 480 + 3072/x + 12x

A(t)  =  [480x + 12x² + 3072 ] / x

A´(t) =  [(480 + 24x )* x  - (480x + 12x² + 3072]/x²

A´(t) =  0         [(480 + 24x )* x  - 480x - 12x² - 3072] =0

480x + 24x² -480x -12x² - 3072 = 0

12x² = 3072         x² = 296

x = 17,20 cm       and      y =  384/17,20      y = 22,32 cm

Notice  if you substitu the value of x = 17,20 in A(t) ; A(t) >0 so we have a minimun at that point

Then dimensions of the poster

p = 17,20 + 8  = 25,20 cm

h = 22.32 + 12 =34,32 cm

A(min) = 25,20 *34.32  

A(min) = 864,86 cm²

7 0
3 years ago
This is so hard i dont not how to simplify them
PIT_PIT [208]

Answer:

x is -2

u is -2

You need to expand the brackets.

The steps are shown in the picture above. Hope this helps

6 0
3 years ago
Read 2 more answers
Write an equation representing all numbers that are 3 units from 7
Dafna1 [17]
Solution : |x+3| =7
or x= -10 or x=4

Explanation:
•You are basically looking for 2 values of X
•First X will be to the left of -3
•Second X will be to the right of -3
•Both X’s will be 7 units away from -3, if you do this correctly you will find that x to the left is equal to -10 and x to the right is equal to 4

You can develop the absolute value equation as follows:
X=-3 -7
Or
X=-3+7

Add 3 to both sides of the equation to get :
X+3=7
X+3=-7

This fits the basic definition of an absolute value equation that states if |x|=y , then x=y or x=-y
3 0
4 years ago
What are two ways to describe a transformation shown on the grid?
Dmitrij [34]

They can be described as a horizontal movement, a vertical movement, or a combination of the two (horizontal and vertical.)

3 0
4 years ago
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