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2 years ago

2.4(0.81) what do i do to solve this problem?? do i multiply and what are the steps

Mathematics

1 answer:

OverLord2011 [107]2 years ago

3 0

Answer:

1.944

Step-by-step explanation:

if the problem was written just like the 2.4(0.81) then yes you multiply

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A plane traveled 1794 miles to Bangkok and back. The trip there was with the wind. It took 13 hours. The trip back was into the

Burka [1]

Answer:

The speed of wind is 30 miles/hour

Speed of plane in still air is 108 miles /hour

Step-by-step explanation:

Distance traveled by plane to Bangkok = 1794 miles

The trip there was with the wind. Time taken = 13 hours.

The trip back was into the wind. The trip back took 26 hours.

Let s = plane speed in still air

let w = speed of the wind

(s+w) = speed of plane with wind

(s-w) = speed of plane against wind

Distance = Speed * Time

When the trip was with the wind .

⇒ $1794 =(s+w)\times13$

⇒ $\frac{1794}{13}=s+w$

⇒ $138=s+w$ ---1

When The trip back was into the wind.

⇒ $1794 =(s-w)\times23$

⇒ $\frac{1794}{23}=s-w$

⇒ $78=s-w$ ---2

Add 1 and 2

⇒s+w+s-w =138+78

⇒2s =216

⇒ $s=\frac{216}{2}$

⇒ $s=108$

To find w substitute the value of s in 1

⇒ $138=108+w$

⇒ $138-108=w$

⇒ $30=w$

Thus the speed of wind is 30 miles/hour

Speed of plane in still air is 108 miles /hour

4 0

3 years ago

What is the best method

Ksenya-84 [330]

Answer:

completing the square

Step-by-step explanation:

4 0

3 years ago

Read 2 more answers

During the first stages of an epidemic, the number of sick people increases exponentially with time. Suppose that at = 0 days th

nydimaria [60]

T = days passed

r = rate of growth

by 0 day, or t = 0, there are 2 folks sick,

$\bf \qquad \textit{Amount for Exponential Growth}
\\\\
A=P(1 + r)^t\qquad 
\begin{cases}
A=\textit{accumulated amount}\to &2\\
P=\textit{initial amount}\\
r=rate\to r\%\to \frac{r}{100}\\
t=\textit{elapsed time}\to &0\\
\end{cases}
\\\\\\
2=P(1+r)^0\implies 2=P\cdot 1\implies 2=P\qquad \boxed{A=2(1+r)^t}$

by the third day, t = 3, there are 40 folks sick,

$\bf \qquad \textit{Amount for Exponential Growth}
\\\\
A=P(1 + r)^t\qquad 
\begin{cases}
A=\textit{accumulated amount}\to &40\\
P=\textit{initial amount}\to &2\\
r=rate\to r\%\to \frac{r}{100}\\
t=\textit{elapsed time}\to &3\\
\end{cases}
\\\\\\
40=2(1+r)^3\implies 20=(1+r)^3\implies \sqrt[3]{20}=1+r
\\\\\\
\sqrt[3]{20}-1=r\implies 1.7\approx r\qquad \boxed{A=2(2.7)^t}$

how many folks are there sick by t = 6? $\bf \stackrel{that~many}{A=2(2.7)^6}$

8 0

3 years ago

The surface area of the figure

kirza4 [7]

525cm bro because i just took it right now

4 0

3 years ago

Jeremy has $1200 in spending money for the fall semester of college. He needs to purchase car insurance at $120 for 4 months, $2

abruzzese [7]

Answer:

Jeremy Will have more than just $200 to spend on Christmas presents.

Explanation :

He has a total of $1200.

He spends a $120 for car insurance. (1)

He needs to spend $25 a week for lunch. He has to do this for 16 weeks so 25*16 = $400. (2)

He needs to spend $20 a week for entertainment. For 16 weeks that'll be 20*16 = $320 (3)

adding (1) (2) and (3)

We get Jeremy's total spending will be $840. Jeremy has $1200.

1200-840 = $360

So Jeremy will have $360 to spend on Christmas present.

6 0

2 years ago