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2 years ago

12

In a pile of coins there are 7 more quarters than nickels. If there is a total of$2.65 in coins, how many quarters are there?

2 answers:

Alinara [238K]2 years ago

6 0

<span>A quarter is equivalent to 25 cents or $0.25 and a nickel is equal to 5 cents or $0.05. In the given in this item, if there are x nickels then, there are x + 7 quarters. With these and the total amount known, we can now compute for the value of x.
(x)(0.05) + (x + 7)(0.25) = 2.65
Simplifying,
0.05x + 0.25x + 1.75 = 2.65
Simplifying further,
0.3x = 0.9
The value of x from the equation is 3. Hence, there are 10 quarters.</span>

Cloud [144]2 years ago

3 0

Answer:

NONE

Step-by-step explanation:

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2 years ago

Find the area of the given triangle to the nearest square unit. Angle a= 30 degrees, b=10, angle B=45 degrees

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$A=34\ units^2$

Step-by-step explanation:

Suppose we have a general triangle like the one shown in the figure.

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By definition I know that the sum of the internal angles of a triangle is always equal to 180 °.

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We already know the three triangle angles.

Now we use the sine theorem to calculate the sides c and a.

The sine theorem says that:

$\frac{sin(A)}{a}=\frac{sin(B)}{b}=\frac{sin(C)}{c}$

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$\frac{sin(30)}{\frac{sin(45)}{10}}=a$

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$\frac{sin(105)}{c}=\frac{sin(45)}{10}$

$\frac{sin(105)}{\frac{sin(45)}{10}}=c$

$c=13.660$

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$A=\sqrt{s(s-a)(s-b)(s-c)}$

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$s=\frac{a+b+c}{2}$

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2 years ago

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4vir4ik [10]

Answer:

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Then you simplify that fraction to 2 and thats how you get your answer.

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3 years ago