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3 years ago

9

14 POINTS AND BRAINLYEST !!!!!! A box contains 7 red marbles, 4 white marbles, and 5 blue marbles. If only white marbles are add

ed to the box, how many must be added to make the probability of drawing a white marble 1/3?

1 answer:

dybincka [34]3 years ago

3 0

Answer:

3 (at least, 3 is the closest integer)

Step-by-step explanation:

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Formúla General <br>a) 4x²=9x-2=0 <br><br>b) X²+8x-84=0<br>

makkiz [27]

Answer:<em> </em><em>a)</em> $x=\dfrac{-9 \pm\sqrt{113} }{8}$

<em> b) x₁ = - 14; x₂ = 6.</em>

Step-by-step explanation:

a) 4x² + 9x - 2 = 0

$x=\dfrac{-b \pm \sqrt{b^{2}-4ac } }{2a} \\\\a=4; \: \: b=9; \: \: c=-2\\x =\dfrac{-9 \pm \sqrt{9^{2}-4 \cdot 4 \cdot (-2) } }{2 \cdot 4} =\dfrac{-9 \pm\sqrt{113} }{8}$

b) x² + 8x - 84 = 0

$x=\dfrac{-b \pm \sqrt{b^{2}-4ac } }{2a} \\\\a=1; \: \: b=8; \: \: c=-84\\\\x =\dfrac{-8 \pm \sqrt{8^{2}-4 \cdot 1 \cdot (-84) } }{2 \cdot 1} =\dfrac{-8 \pm\sqrt{400} }{2}=\dfrac{-8 \pm 20}{2} =-4 \pm 10\\\\x_{1} =-14\\x_{2} =6$

7 0

3 years ago

Find the equation of a line that passes through (2,−3), and that is parallel to 5 + = −2.

Eduardwww [97]

Answer:

the first one is the correct answer

Step-by-step explanation:

Try using a graphing calculator for some of these types of questions, it's very helpful

4 0

3 years ago

Last week, Harry ran 5 laps around the lake. Sophia ran 1 5/6 times as many laps around the lake as Harry did. How many laps aro

Valentin [98]

Sophia = (6/6 + 5/6) 5 = 9.16666…
9.1666… is equal to 9 laps

5 0

3 years ago

A rectangle has a length of 9.00 inches and a width of 4.25 inches. What is the area in square inches? Round to the correct sign

katovenus [111]

Write an Expression:

4.25*9 = X

4.25*9 = 38.25 in²

7 0

4 years ago

What is the answer for 2(3a-12)=3(2a-8)

Setler [38]

Answer:

6a-24=6a-24

Step-by-step explanation:

you distribute the 2 on the first equation (2(3a-12)) so 2 times 3a is 6a and -12 times 2 equals -24 so the simple form for the first equation is 6a-24. You do the same for the second equation 3 times 2a is 6a and 3 times -8 is -24. So the equations are the same on each side meaning they have infinite solutions on a graph.

8 0

3 years ago