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3 years ago

5

Daria has 18 coins that are all nickels and quarters. the number of nickels is 3 more than twice the number of quarters. if she

has $1.90 in all, how many nickels does Daria have?

1 answer:

sergij07 [2.7K]3 years ago

3 0

Daria has 12 to 15 nickels because 3x3=9 but u want to double the amount which would be 12 to 15

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Lerok [7]

Answer:

x = 71°

Option B is correct answer.

Step-by-step explanation:

We need to find for what value of x is $sin\: x = cos 19^{\circ}$ , where 0°< x < 90°?

Solving:

$sin\: x = cos\: 19^{\circ}\\Finding \:cos\: 19^{\circ}=0.94551\\Putting\:value:\\sin\:x=0.94551\\Now\:taking\:sin\:inverse\\x=sin^{-1}(0.94551)\\x=71^{\circ}$

So, we get x = 71°

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kobusy [5.1K]

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Steps-
Miles to cover- 50 miles = 50*5280 feet = 264,000 feet
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