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yKpoI14uk [10]
3 years ago
15

What is 0.644 in expanded form

Mathematics
1 answer:
Brrunno [24]3 years ago
4 0
I hope this helps you


0,644


644/1000


161/250
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Anu
bija089 [108]

Answer:

Circumference of Circle B=19.625cm

Step-by-step explanation:

The circumference formula is: 2pie(r) = pie(d)

We have diameter of the first circle which is 6. Now, because the diameter of second circle is 25% greater than this,

Hence, we add 25% in 6:

6+25/100 =6+0.25=6.25 cm

Therefore, we have diameter of 6.25 for circle B.

Now, we need to find the circumference of the Circle A.

circumference= pie(d) = pie(6)= 3.14times6= 18.84

Now use the proportional reasoning to find Circumference of Circle B:

circumference of Circle A/diameter Circle A = circumference of Circle B/diameter Circle B

18.84/6=circumference of Circle B/6.25

Cross multiply and divide:

(18.84times6.25)/6 = Circumference of Circle B

Solve:

Circumference of Circle B=19.625cm

Hope this helps!

Mark brainliest if you think i helped! Would really appreciate!

7 0
3 years ago
Situation:
stepan [7]

Answer:

t = 6162 years

Step-by-step explanation:

This equation takes the form of

N=N_{0}e^{kt}

We are given everything but the amount of C-14 at time t = 0.  But we can figure it out from the info we ARE given.  We are told that when the spear head is found it contains 54% of its original amount of C-14.  Notice we are dealing in percents.  If 54% remains when it is found, it started out with 100% of its amount.  That's our N value.  Filling in:

100=54e^{.0001t}

Our goal is to get that t down from the exponential position that it is currently in.  To do that we will need to eventually take the natural log of both sides, because ln's and e's "undo" each other, much like squaring "undoes" a square, or dividing "undoes" multiplication.  So we take the natural log of both sides.  On the right side, notice that when we take the natural log, the e disappears; it's "undone", gone.  Before that, though, we will simplify by dividing both sides by 54.  100/54 = 1.851851852.  So, altogether...

ln(1.851851852)=.0001t

Simplifying by plugging the log of that number into our calculator, we get

.6161861395 = .0001t  and

t = 6161.8613

Rounding to the nearest year, t = 6162 years

6 0
4 years ago
nick uses 8 dowels to make one birdhouse. if he bought 1,581 dowels, about how many birdhouses will he be able to make? (EXPLAIN
elixir [45]
If you take 1,581 divided by 8, you’ll get 197.625. Round, and you’ll receive about 198. If nick uses 8 dowels for one bird house, he’ll be able to make ABOUT 198 birdhouses.
8 0
3 years ago
10 points worth pls help!
seraphim [82]

Answer:

<h2>1.25</h2>

Step-by-step explanation:

5/4 =

1.25

The first number divided by four is the second number. 5 divided by 4 is 5/4, 1 1/4, OR 1.25

Hope that helps!

3 0
3 years ago
Read 2 more answers
A plane flies round-trip to Philadelphia. It flies to Philadelphia at 220 miles per hour and back home with a tailwind at 280 mi
LuckyWell [14K]
To solve the problem we will use this equation where,

d will be distance.
x is the speed of the plane without tailwind. 
y is the speed of the wind affecting the plane.
Going to Philadelphia the speed of the plane affected by wind will be x-y=220 miles/hr
Coming back with a tailwind, the speed of the plane will be x+y= 280 miles/hr.
since time = distance / speed, t1 =d/220 and t2 = d/280
and since the total time traveled is 6.5hrs
d/220 + d/ 280 = 6.5hrs
d = 800.8 miles x 2 (back and forth trip) the answer is 1601.6 miles
6 0
4 years ago
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