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Bogdan [553]
3 years ago
10

Ifa-b=4 and a^2- b^2=3, what is the value of a+b?

Mathematics
1 answer:
kiruha [24]3 years ago
5 0

Answer:

\large\boxed{a+b=\dfrac{3}{4}}

Step-by-step explanation:

\text{Use}\ a^2-b^2=(a-b)(a+b).\\\\\text{We have}\ a-b=4\ \text{and}\ a^2-b^2=3.\\\\\text{Substitute:}\\\\3=4(a+b)\qquad\text{divide both sides by 4}\\\\\dfrac{3}{4}=(a+b)\to a+b=\dfrac{3}{4}

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Somebody who knows how to do this?? plz answer all the questions correctly thanks!
Ksju [112]

Answer:

a) 5/21

b) 4/21

c) 4/21

d) 8/21

Step-by-step explanation:

total number of coins: 21

a) number if dollars: 5

therefore fraction is 5/21

b) number of quarters: 4

therefore fraction is 4/21

c) number of dimes: 4

therefore fraction is 4/21

d) number of nickels: 8

therefore fraction is 8/21

4 0
3 years ago
Find the value of x<br> in this polygon.<br> help !!!
Paladinen [302]

Answer:

<h2>53°</h2>

solution,

Sum of exterior angle of polygon=360°

3x - 5 + 2x + 10 + 90 = 360 \\ or \: 3x + 2x - 5 + 10 + 90 = 360 \\ or \: 5x + 5 + 90 = 360 \\ or \: 5x  + 95 = 360 \\ or \: 5x = 360 - 95 \\ or \: 5x = 265 \\ or \: x =  \frac{265}{5}  \\ x = 53

Hope this helps...

Good luck on your assignment...

8 0
3 years ago
The length of a rectangle is 5 units more than the width, w. Which expression represents the area of the rectangle?
Slav-nsk [51]
You did not provide a list of expressions to select from.

Let A = area

Let w = width

Let (w + 5) = length

A = (w + 5)w

6 0
3 years ago
Read 2 more answers
Alicia and 3 of her friends entered a robotics competition. The rules
natima [27]

Answer:

A. x/4 = 12

Step-by-step explanation:

Alicia and 3 of her friends are 4 people in total. To find what they spent, you do 4 • 12 = x, which is the same as x/4 = 12

4 0
3 years ago
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Vilka [71]
In 2 hours,hope this helps :)
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