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vlada-n [284]
3 years ago
7

Mrs. Lynch has noted that 7 out of every 10 pieces of mail she gets are junk mail. What percent of her mail is junk?

Mathematics
2 answers:
-BARSIC- [3]3 years ago
8 0
I think it would be 70% of her mail
VikaD [51]3 years ago
5 0

Answer:

70%

Step-by-step explanation:

Any thing out of ten would be any ten out of a hundred. Just move the decimal back two places and you get 70%

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the diameter of earth is 7917.5 mi and the diameter of mercury is 3032 mi. how many times can mercury go inside earth. use 3.14
Law Incorporation [45]

Answer:

Mercury can enter 6.8 times inside the earth

Step-by-step explanation:

To solve this problem we have to calculate the volumes

First we calculate the radius

radius earth = 7917.5mi /2 = 3958.75mi

radius mercury = 3032mi / 2 = 1516mi

To calculate the volume of earth we have to use the following formula:

V = volume

r = radius  = 3958.75mi

π = 3.14

V = ⁴⁄₃πr³

we replace with the known values

V = ⁴⁄₃ * 3.14 * (3958.75mi)³

V = 4.187 * 15671701.56 mi³

V =  65617414 mi³

The volume of earth is 65617414 mi³

To calculate the volume of mercury we have to use the following formula:

V = volume

r = radius  =  1516mi

π = 3.14

V = ⁴⁄₃πr³

we replace with the known values

V = ⁴⁄₃ * 3.14 * ( 1516mi )³

V = 4.187 * 2298256 mi³

V =  9622797 mi³

The volume of mercury is 9622797 mi³

Now we divide the earth volume by the mercury volume

65617414 mi³  / 9622797 mi³  = 6.819

round to the nearest tenth

6.819 = 6.8

Mercury can enter 6.8 times inside the earth

5 0
3 years ago
Sin 1 + sin 2 + sin3 .................+ sin 360 = ?
lesya [120]

Assuming that arcs are given in degrees, call S the following sum:

S = sin 1° + sin 2° + sin 3° + ... + sin 359° + sin 360°


Rearranging the terms, you can rewrite S as

S = [sin 1° + sin 359°] + [sin 2° + sin 358°] + ... + [sin 179° + sin 181°] + sin 180° +
   + sin 360°

S = [sin 1° + sin(360° – 1°)] + [sin 2° + sin(360° – 2°)] + ...+ [sin 179° + sin(360° – 179)°]
   + sin 180° + sin 360°          (i)


But for any real k,

sin(360° – k) = – sin k


then,

S = [sin 1° – sin 1°] + [sin 2° – sin 2°] + ... + [sin 179° – sin 179°] + sin 180° + sin 360°

S = 0 + 0 + ... + 0 + 0 + 0        (... as sin 180° = sin 360° = 0)

S = 0


Each pair of terms in brackets cancel out themselves, so the sum equals zero.

∴   sin 1° + sin 2° + sin 3° + ... + sin 359° + sin 360° = 0          ✔


I hope this helps. =)


Tags:  <em>sum summatory trigonometric trig function sine sin trigonometry</em>

4 0
3 years ago
You read a novel over 7 days.
Bond [772]

Answer:

23.7

Step-by-step explanation:

sum of pages divided by number of days spent

6 0
3 years ago
How do I find slope for this equation please helpppp
Eva8 [605]
Slope is -1
Hope this helped
4 0
3 years ago
Read 2 more answers
Please help me please
Ipatiy [6.2K]

Answer:

-19 5/6 > -20 1/6

I -19 5/6 I < I -20 1/6 I

Step-by-step explanation:

pls mark me branliest

8 0
3 years ago
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