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4 years ago

Can y'all please help.

Mathematics

1 answer:

sattari [20]4 years ago

6 0

Answer:

See explanation

Step-by-step explanation:

Step 1. Substitute for d to solve for n:

From the first equation:

$d=70-n$

Then substitute it into the second equation:

$0.1(70-n)+0.05n=5.5\\ \\7-0.1n+0.05n=5.5\\ \\7+(-0.05n)=5.5\\ \\-0.05n=5.5-7=-1.5\\ \\n=\dfrac{-1.5}{-0.05}=30$

Step 2: Substitute for n to solve for d:

$d+n=70\\ \\d+30=70\\ \\d=70-30=40$

There are 40 dimes and 30 nikels in the piggy bank

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Answer:

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3 years ago

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Answer:

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Step-by-step explanation:

We know that a basketball player made 12 out of 15 free throws she attempted.

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We answer

a) $\frac{12+n}{15+n}=0.85$

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$\frac{12+n}{15+n}=0.85$ ⇒

$12+n=(15+n).(0.85)$ ⇒

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We found out that she needs 5 consecutive free throws to raise the percent of successful free throws to 85 %.

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