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3 years ago

May someone help me with this?

Mathematics

1 answer:

elena-14-01-66 [18.8K]3 years ago

5 0

I am putting this into rows. Ex: row one has 0. row two has blank and seven.

1: 0

2: 9 7

3: - 9 6

4: 1 3

5: - 1 2

6: 1

So the answer on top would be 8 1 r 1.

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[Precalculus] Use trigonometric identities to express:

ehidna [41]

Remark

<u>Two facts.</u>

1) Tan(x) = Sin(x) / Cos(x)

2) Csc(x) and Sin(x) are reciprocal relationships. When multiplied together, they equal 1.

Solution

So Csc(x) * tan(x) = csc(x) * sin(x) / cos(x) = 1/cos(x) = sec(x)

So far what we have is tan^2(x) + sec(x). We have to get rid of tan^2(x)

Use the identity of 1 + tan^2(x) = sec^2(x)

tan^2(x) = sec^2(x) - 1

sec^2(x) - 1 + sec(x)

a^2 + a - 1 <<<<<< Answer

B is the answer.

4 0

3 years ago

The mean score of 15 students was 82.0. (a) Another student joins, and the mean becomes 82.5. What is the new student's score? (

slega [8]

Answer:

a) The new student's score is 90.

b) Their scores are a pair of scores lower than 100 with a mean of 90.5.

Step-by-step explanation:

The mean is the sum of all scores divided by the number of students.

The mean score of 15 students was 82.0

This means that there are 15 students and the sum of the scores is 15*82 = 1230.

(a) Another student joins, and the mean becomes 82.5. What is the new student's score?

Now there are 16 students, the sum of the scores is 1230 + x and the mean is 82.5. So

$82.5 = \frac{1230 + x}{16}$

$1230 + x = 16*82.5$

$x = 1320 - 1230$

$x = 90$

The new student's score is 90.

(b) Suppose instead that two students join, taking the average from 82 to 83. What could their scores be, if they are restricted to be integer (i.e. whole) numbers?

Now there are 2 new students, so 17 in total. The mean score of the new students is 2x. The total score of the class is 1230 + 2x and the mean is 83. So

$83 = \frac{1230 + 2x}{17}$

$1230 + 2x = 1411$

$2x = 181$

$x = 90.5$

The mean of the two students scores is 90.5.

So their scores are a pair of scores lower than 100 with a mean of 90.5.

4 0

3 years ago

The two polygons are similar. Find the Scale Factor between the<br> figures.

egoroff_w [7]

Answer:

x=9.2

Step-by-step explanation:

23/x=17.5/7

cross multiply

17.5x=161

divide

x=9.2

6 0

3 years ago

What is the value of t that makes the equation true 2t+5=2t+5 Do you think there is any value of t that doesn't work how do yo

fgiga [73]

There is infinite answers because no matter what you put the equation will always be true

hope this helped please leave a heart and possibly brainliest(:

3 0

3 years ago

Five teachers and five students want to but ice cream from the cafeteria. The cafeteria sells chocolate,strawberry,cotton candy,

matrenka [14]

Answer:

13.75

Step-by-step explanation:

First you know there are 5 students and 5 teachers, for each student it costs 6.25 and for every teacher it cost 1.50. So 5 teachers x 1.50= 7.5. 5 students x 1.25 =6.25. 7.5 +6.25= 13.75

8 0

3 years ago