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kotegsom [21]
3 years ago
13

How can we know that number or the answer without calculator ?​

Mathematics
2 answers:
Nimfa-mama [501]3 years ago
6 0

Answer:

through factorisization

Step-by-step explanation:

hope it helps

Tamiku [17]3 years ago
5 0

Answer:

factorization

Step-by-step explanation:

Have a good day :)

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Stan guessed on all 10 questions of a multiple-choice quiz. Each question has 4 answer choices. What is the probability that he
algol13

ANSWER
0.756

EXPLANATION

Let x represent number of correct answers.

We can find

   P(x = 0 \text{ or } x = 1)

which leads us to

   P(x\ge 2) = 1 - P(x = 0\text{ or }x = 1)

which uses the compliment of P(x = 0\text{ or }x = 1) to find the probability of getting at least 2 questions correct.

Note that since P(x=0) and P(x=1) are mutually exclusive, we have

   P(x = 0\text{ or }x = 1) = P(x=0) + P(x=1)

Then P(x=0) = 3^{10}/4^{10} = (3/4)^{10} as we have 3^{10} to answer the questions incorrectly divided by the total 4^{10} to answer the questions.

Exactly 1 answer correct: P(x=1) = {}_{10}C_1 \cdot(3/4)^9(1/4)^1

Therefore

   \begin{aligned}
P(x \ge 2) &= 1 - P(x = 0\text{ or }x =1) \\
&=1 - \big[P(x=0) + P(x=1)\big] \\
&=1 - \left[ (3/4)^{10} + {}_{10}C_1 \cdot (3/4)^9(1/4)^1 \right] \\
&\approx 0.756
\end{aligned}

4 0
3 years ago
Read 2 more answers
I really need the awnser ASAP
ANTONII [103]

Answer:

9

count all the whole squares

8 0
3 years ago
Rearrange<br> C=d+2/3<br> to make d the subject.
raketka [301]

Answer:

d = C - 2/3

Step-by-step explanation:

Subtract 2/3 from both sides of the equation:

C = d + 2/3

-2/3     -2/3

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

C - 2/3 = d

3 0
3 years ago
List the first three terms of this sequence: an = 3 • 5n – 1
Nataly [62]

Answer:

1st term = 14

2nd term = 29

3rd term = 44

Step-by-step explanation:

1st term = 3 x (5 x 1) - 1

             = 3 x 5 - 1

             = 15 - 1 =  14

2nd term = 3 x (5 x 2) - 1

               = 3 x 10 - 1

               =30 - 1 = 29

3rd term = 3 x (5 x 3) -1

               = 3 x 15 - 1

               = 45 - 1 = 44

5 0
3 years ago
I need to solve these two equations using either substitution or elimination
vitfil [10]

Answer:

y = -15

x = -10

Step-by-step explanation:

1/4x - 1/2 = 5 (1)

3x + 2/3y = -40 (2)

Multiply (1) by 4

1/4x - 1/2 = 5

1/4x * 4 - 1/2y * 4 = 5 * 4

4/4x - 4/2y = 20

x - 2y = 20 (3)

Multiply (2) by 3

3x + 2/3y = -40 (2)

3x * 3 + 2/3y * 3 = -40 * 3

9x + 6/3y = -120

9x + 2y = -120 (4)

x - 2y = 20 (3)

9x + 2y = -120 (4)

Using elimination method, Add (3) and (4)

9x + x = -120 + 20

10x = -100

x = -100/10

x = -10

Substitute x = -10 into (3)

x - 2y = 20 (3)

-10 - 2y = 20

-2y = 20 + 10

-2y = 30

y = 30/-2

y = -15

y = -15

x = -10

8 0
3 years ago
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