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Galina-37 [17]
3 years ago
6

Tính nhẩm: a, 138^2-38^2 b, (10^2+8^2+6^2+4^2+2^2)- (9^2+7^2+5^2+3^2+1^2) PLZZZ, giúp vs

Mathematics
1 answer:
Stels [109]3 years ago
3 0

Answer:

is there a question?

Step-by-step explanation:

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The movement of the progress bar may be uneven because questions can be worth more or less (including zera
kakasveta [241]

Answer:

600

Step-by-step explanation:

Because the tens digit is less than 5, round down to 600

5 0
2 years ago
Read 2 more answers
If the class contains 11 boys and 14 girls, what is the probability of calling on a girl?
Ronch [10]

Answer: P (girl) = 14 / 25

Concept:

Here, we need to know the idea of probability.  

Probability is a measure of the likelihood of an event to occur.  

If you are still confused, please refer to the attachment below for a graphical explanation.

Solve:

Number of boys = 11

Number of girls = 14

Total number of people = 11 + 14 = 25

P (girl) = Favorable / Total (refer to the attachment)

P (girl) = 14 / 25

Hope this helps!! :)

Please let me know if you have any questions

8 0
3 years ago
Show that (1 + 2V3)2 = 13 +4V3
umka2103 [35]
Answer is 072 i think
7 0
3 years ago
Arrange the steps in the correct order to express cos3x in terms of cosx cos(2x)cos(x)-sin(2x)(x) [1-sin^2(x)]cos(x)-[2sin(x)cos
noname [10]

cos(3x) = cos(2x+x)

= cos(2x) cos (x) -sin(2x)sin(x)

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= cos x -2sin^2(x) cos(x) -2sin^2(x) cos(x)

= cos(x) - 4 sin^2(x) cos(x)

cos(x)(1-4sin^2(x))

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= cos(x)-4cos(x)+4cos^3(x)

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4 0
4 years ago
Which best summarizes Pythagorean Theorem
aleksklad [387]

Answer:

A^2 + B^2 = C^2

Step-by-step explanation:

The applies for right triangle where C is the hypotenuse.

3 0
3 years ago
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