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3 years ago

Sebastian has 50 marbles in a bag. 20% of the marbles are green. How many marbles are green?

Mathematics

2 answers:

Ede4ka [16]3 years ago

7 0

Answer: 10

Step-by-step explanation:

50 divided by 10 is 5

10%=5

20%=10

ehidna [41]3 years ago

6 0

Answer:

10 marbles are green

Step-by-step explanation:

Let me explain.

Using price×rate= amount

you do 50x20%= 10. This means that out of the 50 marbles

only 10 are green.

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Find the solution set of the following quadratic equations using the quadratic formula.

oksian1 [2.3K]

Answer:

<h3> 1) $x_1=\dfrac{7+\sqrt{13}}2\,,\quad x_2=\dfrac{7-\sqrt{13}}2$ </h3><h3> 2) $x_1=-\dfrac13\,,\quad x_2=-3$ </h3>

Step-by-step explanation:

$x^2 - 7x + 9 = 0\quad\implies\quad a=1\,,\ b = -7\,,\ c=9\\\\x=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}=\dfrac{-(-7)\pm\sqrt{(-7)^2-4\cdot1\cdot9}}{2\cdot1}=\dfrac{7\pm\sqrt{49-36}}2\\\\x_1=\dfrac{7+\sqrt{13}}2\,,\quad x_2=\dfrac{7-\sqrt{13}}2$

<h3>2)</h3><h3> $3x^2 + 10x=-3\\\\3x^2+10x+3=0\quad\implies\quad a=3\,,\ b =10\,,\ c=3\\\\x=\dfrac{-b\pm\sqrt{b^2-4ac}}{2a}=\dfrac{-10\pm\sqrt{10^2-4\cdot3\cdot3}}{2\cdot3}= \dfrac{-10\pm\sqrt{100-36}}6\\\\x_1=\dfrac{-10+\sqrt{64}}6=\dfrac{-10+8}6=-\dfrac13\,,\qquad x_2=\dfrac{-10-8}6=-3$ </h3>

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3 years ago

Make vthe subjject of the formulaE=mvsquare/ 2<br>find the value of v when m =2 and E=64

Maksim231197 [3]

E=mv²

divide both sides by m

E/m=v²

square root both sides

v=√E/m

m=2,E=64

v=√64/2

v=9/√2

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3 years ago

Va rog ajutati-ma la 5) b) si 6) dau 20 de puncte si coroana !!!

Shtirlitz [24]

Can you translate to english?

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Answer:

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Step-by-step explanation:

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SpyIntel [72]

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3 years ago