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Anastaziya [24]
3 years ago
15

Explain how you could add 678 + 303 using mental math

Mathematics
1 answer:
Vaselesa [24]3 years ago
4 0
678 + 303 = 981

Here are a few examples to get you started:
600 + 300 = 900 
<span>78 + 3 = 81 </span>
<span>900 + 81 = 981
</span>Here's another one:
678 = 600 + 70 + 8 
<span>303 = 300 + 00 + 3 </span>
<span>Add the ones place = 11 </span>
<span>Add the tens place = 70 </span>
<span>Add the hundreds place = 900 </span>
<span>Now add 900 + 70 + 11 = 981</span>
Hope this helps! :-)

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How do businesses help a county’s economy
Ne4ueva [31]

Answer:

Small businesses contribute to local economies by bringing growth and innovation to the community in which the business is established. Small businesses also help stimulate economic growth by providing employment opportunities to people who may not be employable by larger corporations.Business is extremely important to a country's economy because businesses provide both goods and services and jobs. ... Businesses are also the means by which many people get their jobs. Businesses create job opportunities because they need people to produce and sell their goods and services to consumers.

Step-by-step explanation:

4 0
4 years ago
The length of a rectangle is 33 meters less than twice the width. if the area of the rectangle is 464464 square​ meters, find th
vfiekz [6]
Good night from Canada!
Let W be the width in meters
Let L be the length in meters. 

L*W=464464
L=2W-33
(2W-33)*W=464464
2W^2-33W=464464
2W^2-33W-464464=0
Use the quadratic formula to solve for the zeros 
x=-b√b²-4ac/2a
Sub in b=-33 a=2 and c=-464464 and solve using position and negative values for the √b.
We get:
w=490.225 and w=473.725
Through simple algebra we can figure out that x=490.225 is more accurate when using it with the other equations and solving for the given area. 
L=2*490.225-33
L=947.45
947.45*490.225=464463.7

Therefore the length is 947.45m and the width is 490.225m.

Hope this helps!

8 0
3 years ago
Can you help me find x?
kozerog [31]

Answer:

Im 99 percent sure its b or c

Step-by-step explanation:

but wait for the other kid to answer

3 0
3 years ago
Find the intersection points, x^2+y^2-16y+39=0, y^2-x^2-9=0
joja [24]
X^2 + y^2 - 16y + 39 = 0 
<span>-x^2 + y^2 - 9 = 0 </span>
<span>----------------------------------- </span>
<span>2y^2 - 16y + 30 = 0 iff </span>
<span>y^2 - 8y + 15 = 0 iff </span>
<span>(y - 3)(y - 5) = 0 iff </span>
<span>y = 3 or y = 5. </span>

<span>Now plug in y value into any of the given equations (the second one is easier) to find respective x values. </span>

<span>y^2 - x^2 - 9 = 0 </span>
<span>(3)^2 - x^2 - 9 = 0 iff </span>
<span>9 - x^2 - 9 = 0 iff </span>
<span>x^2 = 0 iff </span>
<span>x = 0 </span>
<span>(0, 3) </span>

<span>y^2 - x^2 - 9 = 0 </span>
<span>(5)^2 - x^2 - 9 = 0 iff </span>
<span>25 - x^2 - 9 = 0 iff </span>
<span>16 - x^2 = 0 iff </span>
<span>(4 - x)(4 + x) = 0 iff </span>
<span>x = 4 or x = -4 </span>
<span>(4, 5), (-4, 5) </span>

<span>We have three points of intersection, which are (0, 3), (4, 5), and (-4, 5).</span>
8 0
3 years ago
A bag contains 7 blue cards, 4 green cards, 6 red cards, and 8 yellow cards. You randomly choose a card. How many possible outco
Digiron [165]

It is given that the bag contains 7 blue cards, 4 green cards, 6 red cards, and 8 yellow cards. Thus, there are four colors of cards. So, in randomly a card there are just four possible outcomes. The outcomes are:

1. A Blue Card

2. A Green Card

3. A Red Card

4. A Yellow Card

Their probabilities of occurrence will differ but it is a fact that there will be just four possible outcomes.

5 0
4 years ago
Read 2 more answers
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