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malfutka [58]
3 years ago
12

Will give brainiest!!!

Mathematics
1 answer:
sashaice [31]3 years ago
7 0

Answer:

616/2500

Step-by-step explanation: You first have to find the number of times a Blue marbles was chosen: 22

Then find the total number of marbles that were chosen. Make a fraction out of it: 22/50

You then see how many times tails was flipped: 28

Do the same thing again: 28/50

Then multiply the two fractions together:

22/50 * 28/50 = 616/2500

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He buys a jewel for $180, then sells it for $216. Find his percentage profit.
yan [13]

Answer:20%

Step-by-step explanation:216-180=36. 36/180=.20

6 0
2 years ago
Use Cramer's rule to find the solution to the following system of linear equations.
slavikrds [6]

Answer:

x = 53

y = 30

Step-by-step explanation:

Step(I):-

Given equations are

x -2y =-7 ...(I)

5x-9y =-5 ..(ii)

The matrix form  AX = B

                    \left[\begin{array}{ccc}1&-2\\ 5  & -9\\\end{array}\right] \left[\begin{array}{ccc}x\\y\\\end{array}\right] = \left[\begin{array}{ccc}-7\\-5\\\end{array}\right]

The determinant

= \left|\begin{array}{ccc}1&-2\\5&-9\\\end{array}\right| = -9+10 =1

By using Cramer's Rule

Δ₁ =      \left[\begin{array}{ccc}-7&-2\\\\-5&-9\end{array}\right]



The determinant is     Δ₁ = -9 X -7 - (10 ) = 53

x = Δ₁ / Δ

x = 53

The determinant

Δ₂ =



Δ₂ = -5 +35

     

 

y = Δ₂/Δ =  30

     

5 0
2 years ago
Read 2 more answers
ANSWER ASAP PLEASE !!!
Sauron [17]
3/7 = 0.43 (approx.)
4/9 = 0.44 (approx.)

Hence, 4/9 is bigger. 
6 0
3 years ago
Read 2 more answers
I need help with this problem.<br> x3+4x
Yuki888 [10]

Answer: x=0 x=2i x=-2i

if your factoring: x(x^2+4)

Step-by-step explanation:

(if your solving for x)

x^{3} +4x\\x(x^{2} +4)\\\\x=0\\\\x=\frac{-b}{2a}\frac{+}{-} \frac{\sqrt{b^2-4ac}}{2a} \\\\x=\frac{0}{2}\frac{+}{-} \frac{\sqrt{0^2-16}}{2} \\x={0}}\frac{+}{-} \frac{\sqrt{-16}}{2} \\

x={0}}\frac{+}{-} \frac{4i}{2} \\\\\\x=\frac{+}{-}2i

6 0
1 year ago
Please help
Flauer [41]

Answer:

C

Step-by-step explanation:

A number's absolute value is its distance from zero. -4 is 4 units from zero so its absolute value is 4

Hope this helps!

4 0
3 years ago
Read 2 more answers
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