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belka [17]
2 years ago
5

Help help pls pls pls pls

Mathematics
1 answer:
ZanzabumX [31]2 years ago
4 0

Answer:

this

Step-by-step explanation:

the number of boys is 52, if there are 26 girls and boys, and theres 26 more boys than girls then the answer is 52

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Review the steps of the proof of the identity
astraxan [27]

Answer:

step 2

and then step 3 : the error neutralized the error of step 2

Step-by-step explanation:

sin(a + b) = sin(a)cos(b) + cos(a)sin(b)

and because

sin(-b) = -sin(b)

cos(-b) = cos(b)

we have

sin(a - b) = sin(a)cos(-b) + cos(a)sin(-b) =

= sin(a)cos(b) - cos(a)sin(b)

3pi/2 = 270° or -90°.

sin(3pi/2) = sin(270) = sin(-90) = -1

that means, it is the full radius straight down from the center of the circle.

cos(3pi/2) = cos(270) = cos(-90) = cos(90) = 0

so, step 1 is correct :

sin(A - 3pi/2) = sin(A)cos(3pi/2) - cos(A)sin(3pi/2) =

= sin(A)×0 - cos(A)×(-1) (correct step 2)

but as we see, the provided step 2 is incorrect.

it should have been the indicated

sin(A)×0 - cos(A)×(-1)

and NOT the provided

sin(A)×0 + cos(A)×(-1)

step 3 based on the erroneous step 2 should then have been

sin(A)×0 - (1)cos(A)

but instead another error with the sign was made that neutralized the error of step 2 and we got after this second mistake by pure chance the overall correct step 3

sin(A)×0 + (1)cos(A)

so, again, the first error was made in step 2.

but technically, there was also a consecutive error made in step 3 to bring everything back to the correct approach.

4 0
2 years ago
Here are the questions:
yaroslaw [1]

Answer:

Q1) 0.46 Q2)0.2333

Step-by-step explanation:

Q1) P=(4+12+7)/50 =0.46

Q2) P=7/(4+7+10+9)

6 0
3 years ago
Of the last three chapters tests given in a computer programming class, 11 students passed all three tests , 9 students passed t
mote1985 [20]

Answer:

59%

Step-by-step explanation:

simply, it would be 11+2/22 = 59%

I assume there are no student that passed 0 tests

5 0
3 years ago
What fractions that are less than 3/5
pychu [463]

Answer:

1/8 and 1/12

Step-by-step explanation:

5 0
2 years ago
Which of the following best describes the relationship between (x + 2) and
Troyanec [42]

Answer:

B. (x+2) is a factor

Step-by-step explanation:

3x^2 -x-14

3x^2+6x-7x-14

3x(x+2)-7(x+2)

(3x-7)(x+2)

so, x+2 is a factor of 3x^2-x-14

8 0
3 years ago
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