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julia-pushkina [17]
3 years ago
10

A school libary has 260 dvds in its collection. Given that 45% of the dvdas are science and 40% are about history. How many of t

he dvds are about other subjects?
Mathematics
2 answers:
Darina [25.2K]3 years ago
8 0

Answer:

39 DVDs

Step-by-step explanation:

45% of 260

45/100 ×260

117 DVDs of science

40% of 260

40/100 × 260

104 DVDs of history

So from total subjects science and history

260 - (104+117)

260 - 221

39 DVDs of other subjects

In an easiest way 40 + 45

85% of science and history

So 15 % of other subjects

15/100 × 260

39 DVDs

marshall27 [118]3 years ago
5 0

Answer:

There are 39 dvds of other subjects

Step-by-step explanation:

science= 45% of 260

=\frac{45}{100}*260=9*13=117\\\\History=\frac{40}{100}*260=104\\\\\\Othersubjects=260-(117+104)=260-221=39

OR

100 - (45+40)= 100- 85 = 15%

Other subjects = 15% of 260

=\frac{15}{100}*260=3*13=39

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_____5.Six times a number less four is equal to eight.​
xxMikexx [17]

Answer:

1. 4x = 15

2. 4(n - 3) = 24

3. 2n + 5 = 13

4. (3/4)n = 9

5. 6x - 4 = 8

Step-by-step explanation:

this should be correct. hope this helps!

5 0
2 years ago
When Belinda asked him to what pages his book was opened, he replied that the product of the facing pages was 87,912. To what pa
Liono4ka [1.6K]

Answer:

His book was opened at Page no.296 and Page no.297

Step-by-step explanation:

Let the page number of one page be x

Page number of page facing page no. x = x+1

We are given that the product of the facing pages was 87,912.

So, x(x+1)=87912

x^2+x=87912

x^2+x-87912=0

x^2-296x+297x-87912=0

x(x-296)+297(x-296)=0

(x+297)(x-296)=0

x=296,-297

Since Page no. cannot be negative

So, x=296

x+1=296+1=297

So, his book was opened at Page no.296 and Page no.297

5 0
3 years ago
Solve and find value of y 3x/5x+2=-4
vladimir2022 [97]

Answer:

-8/23

Step-by-step explanation:

3x/(5x+2) = - 4

3x = - 4(5x + 2)

3x = -20x - 8

23x = - 8

x = - 8/23

3 0
3 years ago
What is the sum of all values of m that satisfy 2m (squared) -16m+8=0?
vodomira [7]
<h2>Steps:</h2>

So for this, we will be completing the square to solve for m. Firstly, subtract 8 on both sides:

2m^2-16m=-8

Next, divide both sides by 2:

m^2-8m=-4

Next, we want to make the left side of the equation a perfect square. To find the constant of this perfect square, divide the m coefficient by 2, then square the quotient. In this case:

-8 ÷ 2 = -4, (-4)² = 16

Add 16 to both sides of the equation:

m^2-8m+16=12

Next, factor the left side:

(m-4)^2=12

Next, square root both sides of the equation:

m-4=\pm \sqrt{12}

Next, add 4 to both sides of the equation:

m=4\pm \sqrt{12}

Now, while this is your answer, you can further simplify the radical using the product rule of radicals:

  • Product rule of radicals: √ab = √a × √b

√12 = √4 × √3 = 2√3.

m=4\pm 2\sqrt{3}

<h2>Answer:</h2>

In exact form, your answer is m=4\pm \sqrt{12}\ \textsf{OR}\ m=4\pm 2\sqrt{3}

In approximate form, your answers are (rounded to the hundreths) m=7.46, 0.54

6 0
3 years ago
Bill is h cm tall. Siena is 4cm taller than bill.Write down an expression in terms of h for siena's height in cm
meriva

Since Seina is 4cm taller, her height is h+4.




5 0
3 years ago
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