3 years ago

True or false prime numbers are closed under subtraction?

Mathematics

1 answer:

Amiraneli [1.4K]3 years ago

8 0

Answer:

false

Step-by-step explanation:

You might be interested in

Which inequality will have a dashed boundary line with a shaded area above its graph? 7x − y ≤ 3 x − y ≤ 4 2x − 9y > 2 4x + 7

alexdok [17]

Above the graph

look at them

7x-y <3
x-y<4
2x-9y>2
4x+7y>3

dashed boundary line means it does't include htat means taat the symbol is < or >

cross out first 2

one way is to graph the lines as equations and shade accordingly

2x-9y>2
y<2/9x+2/9
shade on bottom

4x+7y>3
y>-7/4x+3/9
shade on top

aswer is 4x+7y>3

5 0

4 years ago

The line with equation ax+by=20 passes through the points(-2,10) and (1,5) find a and b

Doss [256]

$ax+by=20 \\ \\(-2,10) \\ \\ a*(-2)+b*10 = 20 \\ \\-2a +10b = 20 \\ \\ (1,5)\\ \\ a*1+b*5 = 20 \\ \\ a +5b = 20$

$\begin{cases} -2a+10b =20\\ a+5b =20 \ /*2\end{cases} \\ \\\begin{cases} -2a+10b =20\\ 2a+10b =40 \end{cases}\\--------\\ 20b=60 \ / :20 \\ \\b=\frac{60}{20} =3$

$-2a+10b=20 \\ \\-2a +10*3=20 \\ \\-2a +30=20\\ \\-2a=20-30\\ \\-2a=-10 \ /: (-2)$

$a=\frac{10}{2}=5\\ \\\begin{cases} a= 5 \\b=3\end{cases}$

6 0

4 years ago

Read 2 more answers

What is 6/5 times 3/4 ill mark you brainliest

Shalnov [3]

Answer:

The correct answer is 9/10 all you do is add them across

Hope this helped!

Good luck :p

Brainliest is appreciated <3

~ Emmy

8 0

3 years ago

Read 2 more answers

I NEED HELPPPP ON THIS! 3 questions

goldenfox [79]

Answer:

4. a) y = 3x -2

4. b) y = (2x)/3 -11/3

5. y = -(3x/4) +6

7 0

3 years ago

Plz can you help me

iVinArrow [24]

Answer:

1/2

Step-by-step explanation:

because there are one woman and one man

8 0

3 years ago