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3 years ago

What is 280 million in scientific notation

1 answer:

3 0

The rule of scientifinc notation is that we can use number between 0 and 10, so here we can use 2.8. Lets do this
280 000 000 = 2.8 * 100 * 1 000 000
Now we can just multiply 2.8 by 10 to the power of number of 0 reapeted
So $2.8*10^8$ - its the result

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Steffie makes a scale drawing for a crate with the demensions 15 inches long by 12 inches wide. Her scale factor is 1:3. Brian m

rodikova [14]

Answer:

Dimensions → (5 inches × 4 inches)

Step-by-step explanation:

Scale factor used for the drawing by Steffie = $\frac{1}{3}$

Since, scale factor = $\frac{\text{Dimension of the drawing}}{\text{Actual dimension}}$

For Steffie,

Actual length of the crate = $\frac{\text{Dimension of the drawing}}{\text{Scale factor}}$

= $\frac{15}{\frac{1}{3}}$

= 45 inches

Actual width of the crate = $\frac{12}{\frac{1}{3} }$

= 36 inches

Since Brian used the scale factor = $\frac{1}{9}$

Length of the drawing = Actual length × Scale factor

= 45 × $\frac{1}{9}$

= 5 inches

Width of the drawing = Actual width × Scale factor

= 36 × $\frac{1}{9}$

= 4 inches

Therefore, dimensions of the drawing made by Brian are (5 inches × 4 inches)

6 0

3 years ago

A boat in still water is 32 mph. If the boat travels 72 miles upstream in the same time that it takes to travel 120 miles downst

dalvyx [7]

Dup= 72 miles
ddown= 120 miles 
v= riverspeed 
rup= 32mph - v 
rdown= 32mph + v 
t both ways= t 

d=r*t 
d/r=t 

t=ddown/rdown 
t=dup/rup 

dup/rup = ddown/rdown 

(72)/(32-v)=(120)/(32+v) 
3840-120v=2304+72v 
1536=192v 
v=8

8 0

3 years ago

a taxi service charges an initial fee of $5 plus $1.80 per mile. How many miles can you travel for $12

user100 [1]

First you need to write an equation or an inequality.

5+1.80x<=12
the x here is how many miles you are paying for, now you just solve for x.

5+1.80x<=12
-5 -5

1.80x<=7
/1.80 /1.80
x<=3.8

you can travel only three whole miles, you do not have enough money to go four full miles.

4 0

3 years ago

Como divido 1428 entre 7 doy 28 puntos

Dmitry_Shevchenko [17]

204 branliest plssss

6 0

3 years ago

Read 2 more answers

If you measure 5/6 meter,how many twelfths have you measured

MrMuchimi

You've measured 10/12ths

3 0

3 years ago