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3 years ago

Hi guys really need help w/ this problem will give brainllest for the first person

Mathematics

2 answers:

Vladimir [108]3 years ago

3 0

Answer:

There are 6 nickels, 10 dimes and 13 quarters.

Step-by-step explanation:

number of nickels = n

number of dimes = n+4

number of quarters = (n+4)+3 = n+7

express total amount in cents $4.55 = 455 cents

express total in cents by multiplying quantities of coins by value and adding them up.

455 = 5*n + 10*(n+4) + 25*(n+7) 455 = 5n + 10n + 40 + 25n + 175 240 = 40n n = 6

so number of nickels = 6.

number of dimes = number of nickels + 4 = 6+4 =10

number of quarters = number of dimes + 3 = 10+3 = 13

There are 6 nickels, 10 dimes and 13 quarters.

inn [45]3 years ago

3 0

Answer:

Step-by-step explanation:

dime = 10 cents = 0.10 dollars

quarter 25 cents=0,25 dollars

nickel = 5 cents = 0.05 nickel

o.10 d +0.25 q+0.05 n=4.55 or

10d+25 q+5 n =455

d=4+n

q=d+3

q=4+n+3 ( d=n+4)

q=n+7

10d+25 q+5 n =455 ( substitute d with n+4 and q with n+7)

10(n+4)+25(n+7)+5n = 455

10n+40+25n+175+5n=455

40 n =455-215

<h2>n=6 ( six nickels)</h2>

d=4+n

<h2>dime=10 pieces</h2>

uarter = n+7

<h2>quarter = 13 pieces</h2>

check :

10d+25 q+5 n =455

10(10)+25(13)+5(6)=455

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Usimov [2.4K]

Answer:

$r\approx0.03\text{ or about $3\%$}$

Step-by-step explanation:

The standard compound interest formula is given by:

$\displaystyle A=P(1+\frac{r}{n})^{nt}$

Where A is the amount afterwards, P is the principal, r is the rate, n is the times compounded per year, and t is the number of years.

Since we are compounding annually, n=1. Therefore:

$\displaystyle A = P (1+r)^{t}$

Lester wants to invest $10,000. So, P=10,000.

He wants to earn $1000 interest. Therefore, our final amount should be 11000. So, A=11000.

And our timeframe is 3.3 years. So, t=3.3. Substituting these values, we get:

$11000=10000(1+r)^{3.3}$

Let’s solve for our rate r.

Divide both sides by 10000:

$1.1=(1+r)^{3.3}$

We can raise both sides to 1/3.3. So:

$\displaystyle (1.1)^\frac{1}{3.3}=((1+r)^{3.3})^\frac{1}{3.3}$

The right side will cancel:

$\displaystyle r+1=(1.1)^\frac{1}{3.3}$

So:

$\displaystyle r=(1.1)^\frac{1}{3.3}-1$

Use a calculator:

$r\approx0.03$

So, the annual rate of interest needs to be about 0.03 or 3% in order for Lester to earn his interest.

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Arianna cycles for 3 hours at a speed of 40 mph. what distance did she travel

Phantasy [73]

40 × 3 = 120 miles

that's it

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Answer:

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Step-by-step explanation:

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