Eight less than the product of 3 and a number is 7

1 answer:

4 0

Perhaps you want to know what the number is?

3n -8 = 7
3n = 15 . . . . . add 8
n = 5 . . . . . . . divide by 3

The number is 5.

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a plane flying with the wind travels 630 mi in 1.5hrs. Flying against the wind , the plane travels 1120 mi in 4hrs. Find the rat

Flauer [41]

$\bf \begin{cases}
r=\textit{rate of the plane}\\
w=\textit{rate of the wind}\\
\end{cases}
\\\\

\begin{array}{ccccllll}
&distance&rate&time(hrs)\\
&\textendash\textendash\textendash\textendash\textendash\textendash&\textendash\textendash\textendash\textendash\textendash\textendash&\textendash\textendash\textendash\textendash\textendash\textendash\textendash\textendash\textendash\\
\textit{with wind}&630&r+w&1\frac{1}{2}\\
\textit{against wind}&1120&r-w&4
\end{array}
$

$\bf thus \begin{cases}
630=(r+w)1\frac{1}{2}\to 630=(r+w)\frac{3}{2}
\\\\
1120=(r-w)4\\
--------------\\
630=(r+w)\frac{3}{2}\implies 630\cdot \frac{2}{3}=r+w\\
420=r+w\implies \boxed{420-w}=r\\
--------------\\
thus\\
--------------\\
1120=(r-w)4\implies 1120=4r-4w
\\\\
1120=4(\boxed{420-w})-4w
\end{cases}
$

solve for "w", to find the wind's speed rate,

so hmmm what's the plane's rate? well 420 - w = r :)

5 0

3 years ago

Round 8.61 to the nearest tenth.

maks197457 [2]

8.6 first number after the decimal is the tenths place then the second number after the decimal is the hundredths

5 0

3 years ago

Read 2 more answers

donte bought a computer that was 20% off the regular price of $1.080. If an 8% sales tax was added to the cost of the computer,

koban [17]

So 20% of $1,080 is 216.

1080 - 216 is 864

8% of 864 is 69.12

864 + 69.12 would be $933.12

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3 years ago

N is an integer<br> write the values of n such that

sineoko [7]

Answer:

what did not understand (im a bot)

Step-by-step explanation:

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3 years ago

An ash tree that is 9 yards tall casts a shadow 12 yards long. If a nearby redwood tree is 12 yards tall, how long will the redw

sasho [114]

Answer:

The redwood tree's shadow is 16 yards long.

Step-by-step explanation:

9/12 = 12/x

9x = 144

9x/9 = 144/9

x = 16

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3 years ago