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Law Incorporation [45]
1 year ago
12

Cos2a.cos3a-cos2a.cos7a/sin4a.sin3a-sin2a.sin5a ​

Mathematics
1 answer:
Dmitrij [34]1 year ago
5 0

Answer is -28.37

Step-by-step explanation:

from the numerator cos 2a×cos 3a - cos 2a×cos7a= cos6a^2 -cos 14a^2

= -cos8a^2 for the numerator

from the denominator;

sin4a×sin3a-sin2a×sin5a= sin12a^2 -sin10a^2

= sin2a^2

therefore, combining the equation it gives; -cos8a^2/sin2a^2

a^2 will divide each other,

= -cos8/sin2.

from the calculator,

= - 0.9903/0.0349

= -28.37

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Pam likes to practice dancing while preparing for a math tournament. She spends 80 minutes every day practicing dance and math.
SVETLANKA909090 [29]

Answer:

Part A)

x+y=80

y=x+20

B)

30 minutes

C)

no

If Pam was to spend 60 minutes practicing dance, then she would only get 20 minutes of math. 60-20=40. She would be practicing dance 40 minutes more than math, not just 20.

3 0
1 year ago
Read 2 more answers
Of 360 consumers polled some purchased ice cream some purchase frozen yogurt and some purchased both if 260 people polled purcha
Xelga [282]

Total customers are = 360

Number of polled people who purchased ice cream = 260

Number of polled people who purchased both ice cream and yogurt = 250

Hence, people who purchased only ice cream are=260-250=10

And 360-10=350 are people who purchased yogurt.

So, people who purchased yogurt only = 360-(250+10)=100


8 0
1 year ago
destiny sells pencil cases for $5 each and mechanical pencils for $2 each at the school supply store. she sells p pencil cases a
Andrew [12]

Answer:

Step-by-step explanation:

5p + 2(p + 4) .......because pencil cases (p) sell for 5 bucks a piece....and mechanical pencils (p + 4), sell for 2 bucks a piece. She is basically selling 4 more mechanical pencils then she is pencil cases.

8 0
2 years ago
A survey was administered to high school seniors in Anytown. According to the survey results, fewer than 0.5% of the students dr
Feliz [49]

Answer: high test-retest reliability

Step-by-step explanation: this is because the result of the survey was thesame with the previous result, despite the space of time between when the first survey was conducted and when the second survey was conducted. There was know observable difference in result and if conducted in the next 3 months again, it will give same result, this strongly indicate that the survey has high test-retest reliability.

8 0
1 year ago
On your birthday you receive a new TV valued at $1199. The value of the TV decreases by 25% each year. What will its value be 4
earnstyle [38]

Answer: 74.93

Step-by-step explanation:   if you heard of the line equals line method this should be able to help you.  

299.75                     25%

---------------=------------------  

$1199                     100%      

so you cross multiply 1199 and 25 and then divide it by 100.   which would be 299.75 that is the price per 1 year then you divide that value by 4 and that will be your answer.  

299.75 divided by 4= 74.93  

hope this helps

4 0
1 year ago
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