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Norma-Jean [14]
3 years ago
11

Hello ! :) please help me with a for me to mark you brainlst :)

Mathematics
2 answers:
bixtya [17]3 years ago
6 0
It’s positive!! hope that helps!
Fittoniya [83]3 years ago
5 0
They are right it’s positive!
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Marco purchased a large box of comic books for $300. He gave 15 of the comic books to his brother and then sold the rest on an i
Yuri [45]

Answer: There are 75 books.

Price of each book = $4.

Step-by-step explanation:

Let x = Number of books in the box.

Then as per given,

Cost of x books = $300

Cost of one book = \$(\dfrac{300}x)

Books left after giving 15 of them = x-15

Selling price of (x-15) books=  $330

Selling price of one book = \$(\dfrac{330}{x-15})

Profit on each book= $1.50

Profit = selling price - cost price

\Rightarrow 1.50=\dfrac{330}{x-15}-\dfrac{300}{x}\\\\\Rightarrow\ 1.50=\dfrac{330(x)-300(x-15)}{x(x-15)}\\\\\Rightarrow\ 1.50=\dfrac{330x-300x+4500}{x^2-15x}\\\\\Rightarrow\ 1.50(x^2-15x)=30x+4500\\\\\Rightarrow\ 1.50x^2-22.5x=30x+4500\\\\\Rightarrow\ 1.50x^2-52.5x-4500=0\\\\\Rightarrow\ 1.50x^2-52.5x-4500=0\\\\\Rightarrow\ x^2-25x-3000=0\ \ [\text{divide by 1.5}]

\Rightarrow (x+40)(x-75)=0\\\\\Rightarrow\ x=-40,75

Number of books cannot be negative.

So, there are 75 books.

Price of each book = \dfrac{300}{75}=\$4

So price of each book = $4.

5 0
3 years ago
Can the ratio of a parents age to his or her child's age ever be exactly 3:2? explain.
Deffense [45]

Answer:

Yes.

Step-by-step explanation:

Yes , for example a parent might be 48 and the child 32 years old. The parent had the child when they were 16.

6 0
3 years ago
Explain how you would find the answer of -(5x5x5) full answer gets brainly
Simora [160]

Answer:

−5x^10

Step-by-step explanation:

-(5x5x5)

−5x^5x^5

add the exponets and you should get

−5x^10

6 0
3 years ago
Read 2 more answers
How can u tell when a rate is a unit rate
r-ruslan [8.4K]
<span>When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. If you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.</span>

6 0
3 years ago
Please help me with this question :)​
777dan777 [17]

Answer:

The 3rd option is the correct answer.

Step-by-step explanation:

(-24 *|x|)/8= -30

-24*|x|= -30 *8

-24*|x| =-240

|x|= -240/-24

|x| =10

x= 10 or -10

8 0
3 years ago
Read 2 more answers
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