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4 years ago

HELP!!!

1 answer:

6 0

Choosing "r" things from a set of "n" can be done in this many ways:
combinations = n! / [r! * (n-r)!]
combinations = 7! / [3! * 4!]

combinations = 7 * 6 * 5 / 6
combinations = 35

Source:http://www.1728.org/combinat.htm

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Angela has a collection of nickels and quarters worth $8.80. If she has 68 total nickels and quarters, how many quarters does sh

pav-90 [236]

27 quarters because 27 multiplied by $0.25 for the amount each quarter is worth is $6.75 meaning that the rest 41 coins would be Nickels multiplied by $0.05 the amount a nickel is worth giving us $8.80 dollars.

I probably said that in a confusing way sorry but the answer is (27 quarters)

4 0

3 years ago

If the numerator of a fraction is increased by six, the value of the fraction will increase by one. If the denominator of the or

Alchen [17]

Answer:

$\dfrac{7}{6}$

Step-by-step explanation:

Let $\dfrac{a}{b}$ be the original fraction.

If the numerator of a fraction is increased by six, the value of the fraction will increase by one. Hence,

$\dfrac{a+6}{b}=\dfrac{a}{b}+1$

If the denominator of the original fraction is increased by 36, the value of the original fraction will decrease by one. Hence,

$\dfrac{a}{b+36}=\dfrac{a}{b}-1$

Add these two equalities:

$\dfrac{a+6}{b}+\dfrac{a}{b+36}=\dfrac{a}{b}+1+\dfrac{a}{b}-1\\ \\\dfrac{a+6}{b}+\dfrac{a}{b+36}=2\dfrac{a}{b}\\ \\\dfrac{a}{b+36}=\dfrac{2a-(a+6)}{b}\\ \\\dfrac{a}{b+36}=\dfrac{a-6}{b}\\ \\ab=(a-6)(b+36)\\ \\ab=ab+36a-6b-216\\ \\36a-6b-216=0\\ \\6a-b-36=0\\ \\b=6a-36$

Substitute it into the first equation:

$\dfrac{a+6}{6a-36}=\dfrac{a}{6a-36}+1\\ \\\dfrac{a+6}{6(a-6)}=\dfrac{a}{6(a-6)}+1\\ \\a+6=a+6(a-6)\\ \\a+6=a+6a-36\\ \\6a=6+36\\ \\6a=42\\ \\a=7\\ \\b=6\cdot 7-36=42-36=6$

Thus, the initial fraction was

$\dfrac{7}{6}$

6 0

4 years ago

Evaluate: -5g - 6 for g = -2 A. 4 B. 16 C. 10 D. -13

muminat

substitute the given value for g into the expression and evaluate

- 5g - 6 = (- 5 × - 2 ) - 6 = 10 - 6 = 4 → A

5 0

4 years ago

You are dealt one card from a standard deck of 52 cards.

natima [27]

Answer:

Can u please say the other number

Step-by-step explanation:

8 0

3 years ago

What is the total cost of troys order? PLEASE HELP ME WITH THIS QUESTION :0

jonny [76]

The answer is $93.75 because $3.15 times 8 equals $25.20. Then, $1.85 times 15 equals $27.75. And finally, $3.40 times 12 equals $40.80! Your final step would be to add them all together, which equals $93.75. Therefore,

Your final answer is $93.75.

8 0

4 years ago