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Vladimir [108]
3 years ago
6

How much does the book cost?

Mathematics
1 answer:
lina2011 [118]3 years ago
6 0
Okay so the two equations are (b-book d-dvd)
d-4=b
and 3d+b=28

so to solve this if we know that a dvd costs £4 more than a book and we have 3 of them then if we take 3 lots of 4 away from the 28 then we will have an amount equal to 4 books
so 28-12=14
14/4= £3.50
if 1 book is £3.50 then a dvd is £7.50 as it is £4 more
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Please help! Brainliest if you explain
My name is Ann [436]
Switch sides

4/5 (x+3)=y+6

Multiply both sides by 5

5*4/5 (x+3) = 5y+5*6

Simplify

4(x+3) = 57+30

Divide both sides by 4

4(x+3)/4 = 5y/4+ 30/4

Simplify

x+3 = 5y+30/4 

Subtract 3 from both sides

x+3 - 3 = 5y+30/4 - 3

Simplify 

x=5y+30/4 - 3











3 0
3 years ago
Which is the domain of the function shown in the mapping
erastova [34]
The domain is the x-values of a function, which are also known as the input. When writing down the domain, you write the numbers from least to greatest. Therefore, the correct answer is A.
6 0
4 years ago
There are 3 blouse and 2 pieces cloths for sale in the market. how many possible sets are there?​
Andrew [12]

Answer:

Each item could be included in a set or not included. That gives 2^5 = 32 ways to choose sets, including 1 set with no items, 5 sets of 1 item, 10 sets of 2 items, 10 sets of 3 items, 5 sets of 4 items, and 1 set of 5 items.

7 0
3 years ago
If m = 70, m = 2x, and m = 3x – 10, what is the m? 32 38 48 16
stepan [7]

Answer:

Equating two of the equations;

3x-10=2x

-10=2x-3x

-10=-x

X=10

Therefore x=10

3 0
3 years ago
The population of turtles is doubling every 3 months. If there are 400 turtles now, how many will there
QveST [7]

First we need to know how many months is 2 years. To answer that we multiply the number of months in a year by 2 and get 48 months.

Every 3 months the population of turtles doubles, but to get how many times the population doubles, you need to divide 48 months by 3 to get 16.

So population of 400 will get <u>doubled</u> 16 times in the following <u>two</u> years.

We construct the following equation where p is the final population,

p=400\cdot2\cdot16=\boxed{12800}

Hope this helps. :)

4 0
4 years ago
Read 2 more answers
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