3 years ago

10 POINTS!!!!!!!!!!!!

Mathematics

2 answers:

mote1985 [20]3 years ago

8 0

Bigger to smaller I think...

take the smaller length divide by the larger length
1.45/5.8 = 0.25

Verizon [17]3 years ago

5 0

0.25 would be you answer, could you please mark as brainliest??

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What percent of a present amount of radioactive radium (226Ra) will remain after 1200 years? The half life of 226Ra is 1599 year

sp2606 [1]

Answer:

59.44%

Step-by-step explanation:

$M_{R} = \frac{M_{O} }{2^{n} }$

$n=\frac{t}{t\frac{1}{2} }$

Where $M_{R}$ = mass remaining

$M_{O}$ =original mass.

t= time

$t\frac{1}{2}$ =half life

$t\frac{1}{2}$ =1599, t= 1200, $M_{O}$ =226, $M_{R}$ =?

$n=\frac{1200}{1599}$

n= 0.750469

$M_{R} = \frac{226}{2^{ 0.750469} }$

$M_{R}$ =134.3367amu

percentage of mass remaining = $\frac{134.3367amu}{226amu}$ *100%

= 59.44%

8 0

3 years ago

Departure: 6:50 P.M. Arrival: 11:59 P.M. Travel time: ?

valkas [14]

5 hours and 9 minutes

7 0

3 years ago

Read 2 more answers

Can someone do these 20 problems for me I’ll make whoever answers first the Brainlylist … Due today

zepelin [54]

31). 9m=-2-52

m=-54÷9

ans=-9

7 0

3 years ago

Read 2 more answers

Help me if correct i will mark branliest

Pepsi [2]

Answer:

c = 17

Step-by-step explanation:

a^2 + b^2 = c^2

= 8*8 + 15*15

= 64 + 225

= 289

= 289 SQUARED

= 17

5 0

3 years ago

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E = cos20º + cos40º + cos60º + … cos160º + cos180º

r-ruslan [8.4K]

Answer:

C) – 1

Step-by-step explanation:

E = cos20º + cos40º + cos60º +cos80° + cos 100°+cos120° +cos140° +cos160º + cos180º

E= 0.9 + 0.76 + 0.5+0.17+(-0.17)+(-0.5)+(-0.76) + ( – 0.9 ) + (– 1 )

E= 0.9 + 0.76 + 0.5 +0.17 - 0.17 - 0.5 -0.76 – 0.9 – 1

E= – 1

So ; equal – 1

I hope I helped you^_^

8 0

3 years ago