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2 years ago

What is 2/3 divided by -2/7

Mathematics

1 answer:

satela [25.4K]2 years ago

4 0

$\leadsto \sf \dfrac{2}{3} \div \dfrac{ - 2}{7}$

$\\ \\$

$\leadsto \sf \dfrac{2}{3} \times \dfrac{ - 7}{2}$

$\\ \\$

$\leadsto \sf \dfrac{ - 7}{3}$

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What 2 numbers add to get 2 and multiply to 4

rusak2 [61]

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4=1 times 4
2 times 2
they don't add to 2
set up equation
x+y=2
xy=4

first equation, subtract x from both sides
y=2-x
subsitute for y
x(2-x)=4
distribute
2x-x^2=4
add x^2
2x=x^2+4
subtract 2x
0=x^2-2x+4
use quadratic formula which is
if you have ax^2+bx+c=0 then
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1x^2-2x+4=0
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c=4
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x= $\frac{ 2+/-\sqrt{4-16} }{2}$
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we have $\sqrt{-12}$ and that doesn't give a real solution
therefor there are no real solutions
but if you want to solve fully
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i= $\sqrt{-1}$
x= $\frac{ 2+/-2i\sqrt{3} }{2}$
x= $1+/-i\sqrt{3}$
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4 years ago

Which graph represents x - 1 ≤ 3

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The first graph.

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Since this is your sign $\leq$ the arrow has to point towards the left, and the circle needs to be colored in.

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answer
x = 108, y = 36 and z = 54</span>

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Step-by-step explanation:

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