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krok68 [10]
3 years ago
14

Sharon read a 300-page book. She read at a rate of 15 pages per day in d days.

Mathematics
2 answers:
Gnom [1K]3 years ago
8 0
15 times D= 300    
 the 15 is pages
 D is pages per day
 300 is amount of total pages           
uysha [10]3 years ago
6 0

Answer:

300=15d

Step-by-step explanation:

that is the answer because

Sharon read  300, pages at a rate of 15 , 15 pages per day. The number of days read is unknown, which we’re calling d.

The, rate times the number of day is equal to 300, 300.

We can describe this situation with an equation:

15, 15 d 300, 300,

We can also write this as:{15}300=15 300 equals 15, d, {15}}d=  

15

300

​  

start color  d, end color  equals, start fraction, start color # 300, end color  divided by, start color  15, end color  end fraction, or  

15

300

​  

=d fraction,, 300,, divided by 15  equals,  d,

The equation is 300=15d300,=15d300, equals, 15, d or any of the equivalent equations above.

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Answer:

see explanation

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If three times a number decreased by 10 is 25, what is the number
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3 years ago
Does anyone understand 1 or 2? Please answer
telo118 [61]

Answer:

See below

Step-by-step explanation:

You need to create an equation that will give you the results with the correct units of measurement that they are asking for.  In the first question, they are asking you to give the answer in seconds.  So when you set up your equation, seconds have to be on the top.  The way to think of this is to actually reword the statement they give you by saying in 1 second, light travels 3 x 10 to the 8th power which is 3 with 8 zeros after it.  Then it's easier to set up the equation as below.  The distance from the Sun to Mars is 230,000,000,000 meters which is the same as saying 2300 x 10 to the 8th power.  Notice I counted 8 of the zeros and used that in the exponent but left the rest as part of the original number.  This will make it easier since you are dealing with two number that have exponents raised to the same power of 8.

   1 sec          2300 x 10⁸ m

--------------  X  --------------------  =

 3 x 10⁸ m             1

When you look at this equation it looks difficult but since both the top number and bottom number are exponents raised to the same power, they cancel each other out.  So you can drop the exponent all together and just divide the top number by the bottom number  2300 ÷ 3 which equals 766 seconds.

The second question needs you to take the distant the Sun is from Earth and subtract that from the distance from the Sun to Mars.  By subtracting those two, it will tell you how far Mars is from the Earth.  You can change the numbers a little bit to make it easier on you.  Again you want the exponent for both numbers to be the same to make it easier.  When you subtract two number with the exact same exponent, you can just subtract the number and then use that same exponent as part of your answer.

The distance between the Sun and Mars is 23 with 10 zeros after it.  So that is the same as writing 23 x 10¹⁰.  The distance from the Sun to Earth is said to be 1.5 x 10¹¹ but that is a different exponent.  So if you move the decimal on this number one place to the right, it will be 15 x 10¹⁰.  Now you can easily subtract those numbers without worrying about the exponent since they are the same.

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