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3 years ago

Please help me!!! I really need help on this question I promise to mark brainlest!

Mathematics

2 answers:

Elina [12.6K]3 years ago

4 0

Answer:

I think it's C

Step-by-step explanation:

Can I get brainliest..?

Rina8888 [55]3 years ago

3 0

Answer:

i think its c

Step-by-step explanation:

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Factorise this expression as fully as possible<br> 8x2-<br> - 4X

NARA [144]

Answer:

4x(2x - 1)

Step-by-step explanation:

8x² - 4x ← factor out 4x from each term

= 4x(2x - 1)

6 0

2 years ago

Dividing fractions 1/8 / 1/3

agasfer [191]

1/8×3/1=3/8
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8 0

4 years ago

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There are 12 red checkers and 3 black checkers in a bag. Checkers are selected one at a time, with replacement. Each time, the c

Firdavs [7]

I will use the binomial distrubion to find the probability.

$\displaystyle
P(A)=\binom{n}{k}p^k(1-p)^{n-k}$

------------------------------------------------------

A - selecting a red checker exactly 7 times in 10 selections

$n=7\\
k=10$

$\displaystyle
P(A)=\binom{10}{7}\cdot\left(\dfrac{12}{15}\right)^7\cdot\left(1-\dfrac{12}{15}\right)^{10-7}\\\\
P(A)=\dfrac{10!}{7!3!}\cdot\left(\dfrac{4}{5}\right)^7\cdot\left(1-\dfrac{4}{5}\right)^3\\\\
P(A)=\dfrac{8\cdot9\cdot10}{2\cdot3}\cdot\dfrac{16384}{78125}\cdot\left(\dfrac{1}{5}\right)^3\\\\
P(A)=120\cdot\dfrac{16384}{78125}\cdot\dfrac{1}{125}\\\\
P(A)=\dfrac{393216}{1953125}\approx0.2=20\%$

5 0

3 years ago

A tutor charges 30.00$ for two hours of tutoring how much money would the tutor make in nine hours

AleksAgata [21]

Answer:

135

Step-by-step explanation:

A tutor charges 30.00$ for two hours of tutoring how much money would the tutor make in nine hours

7 0

3 years ago

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Jenny has 3 times as many storybooks as David. David has 60 fewer storybooks than Huiling. They have 460 storybooks altogether.

kolbaska11 [484]

Answer:

240

Step-by-step explanation:

Since David has 60 fewer storybooks than Huiling, take the total number of storybooks, which is 460 and minus it by 60.

460-60=400

Now, there are 5 units, 5units=400

1unit=80

Since Jenny has 3 times as many storybooks as David, Jenny has 3 units, 3unit=80x3=240

Tip: Draw a model to help you visualise the question better.

5 0

3 years ago