3 years ago

Which of following is a key element in the proof of the law of cosines

1 answer:

3 0

In proving using the law of cosines, you need to consider these two key elements. The first element is a^2 + b^2 - 2abcosC and the second one is cosine^2 theta + sin^2 theta is equal to 1. Law of Cosines is derived from the Pythagorean Theorem

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Ben adopted 2 cats and 3 dogs. He spent a total of $455. If each dog cost him $82, how much did one cat cost him?

monitta

Answer:$104.5

Step-by-step explanation:

cats=c

Dogs=d

2c+3d=455

d=82

Substitute d=82 in 2c+3d=455

2c+3(82)=455

2c+246=455

Collect like terms

2c=455-246

2c=209

Divide both sides by 2

2c/2=209/2

c=104.5

1 cat cost $104.5

5 0

3 years ago

Plz hurry 15 points

finlep [7]

Answer:

Step-by-step explanation:

3^3 is 27 so

27·27/3^4

3^4 is 81 so

27·27/81

27·27 is 729 so

729/81

729÷81 is 9

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3 years ago

John want to buy a pair of boots that originally cost $85.99 He found a coupon for %30 off what will he pay for the boots?

gulaghasi [49]

Answer:

$60.19

1.) 85.99 x 0.30

2.) 25.797 - 85.99

3.) 60.193

4.) round

$60.19

Hope this helped!

3 0

3 years ago

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Find the sum of the first 50 terms in the sequence where a1=2.1 and a50=1.2

Elan Coil [88]

Answer:

82.5 (assuming it is an arithmetic sequence)

Step-by-step explanation:

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3 years ago

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Leo walks dogs to earn money. He makes $36 each week. He is saving to buy a racing bicycle that costs $1,350. Leo thinks he can

Shkiper50 [21]

Answer:

Leo is correct

Step-by-step explanation:

You would multiply 36 by 52 to get $1872 which is more than enough to get the bike

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3 years ago

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