Mathematics College

9. Con 12 libros de diferentes autores, cuántas selecciones de 7 libros se pueden

hacer si:

a. Un libro determinado se incluye siempre.

b. Un libro determinado nunca se incluye.​

Answers

Answer 1
answer is 14 because 3x4 is 12 +2 = 14

Related Questions

The total after-tax cost of a laptop computer is 1610.60 the local sales tax rate is 5.7% what is the retail pretax price

Answers

It should 43% since it’s the value

PLEASE HELP!! I HAVE TO TURN THIS IN IN 10 MINUTES

Answers

Answer:

0.8

Step-by-step explanation:

Please let me know if you want me to add an explanation as to why this is the answer/how I got this answer. I can definitely do that, I just wouldn’t want to write it if you don’t want me to :)

ANSWER FOR A BRAINLIEST Solve the system of two variables by substitution

Answers

Answer:

Substitution is when you isolate a variable-

3) We can divide the first equation by 6 to get x+y=-1, then isolate to get y=-1-x. We plug this into the second equation to have 3x+(-1-x)=-13. We simplify and get 2x=-12 so x=-6. We plug this back into the first equation and get -6+y=-1 so y=5. So the answer as an ordered pair is (-6,5).

4) We can isolate the second equation to get x=2y+11. We substitute this into the first equation to have -7(2y+11)-2y=-13. We simplify and get -16y=64 so y=-4. We plug this back into the second equation and get x+8=11 so x=3. So the answer as an ordered pair is (3,-4).

help plsssss ill mark brainliest​

Answers

Answer:

A = 38.5

Step-by-step explanation:

13 percent increase of 130

Answers

146.9 because you must multiply the 130 with 13 and notice 13 percent of 130

Evaluate the expression below.
(8.1+7.9)x - (25 division 5)x

Answers

Answer:

11x

Step-by-step explanation:

Start by simplifying the parentheses. (8.1+7.9)=16 and (25/5)=5. Next, distribute each x into the parentheses. You should now have 16x-5x. Since they share like terms, you can subtract them.

A children's pool contains 17,500 milliliters. How many liters are in the pool

Answers

Answer:

17.5

Step-by-step explanation:

Liz has two gardens and wants to build a fence around each. She wants to buy all the fencing at one time. The diagram below shows her two gardens. Which of the following correctly shows the total amount of fencing, in feet, Liz will need to buy for both gardens ? A. Total: 29 x B. Total: 11 x + 4 C. Total: 22 x + 16 D. Total: 11 x + 8​

Answers

Answer:

29

Step-by-step explanation:

Which expression is equivalent to 6x + 7 – 12.2 - (32 + 2) - x?

Answers

5x-39.2
You get this answer my combining like terms

4 x 2/7 Pls solve it for me

Answers

Answer:

8/7 or 1 1/7

Step-by-step explanation:

4/1 x 2/7 = 8/7

8/7
(And as a mixed fraction it’s 1 1/7)

Alicia borrowed $3000 from the bank at a rate of 12% simple interest per year. She earned 1440. How many years was the loan.?

Answers

Answer:

1440 $

Step-by-step explanation:

3000 - 100%

x - 12%

360 - 1 years

how do u do this but in clear

Answers

Answer:

Look at the explanation :)

Step-by-step explanation:

Angle 2 and 3 are supplementary angles, which means they are equal.

Therefore, if

Angle 2 = 4x - 26

and

Angles 3 = 3x + 4,

It means that 4x - 26 = 3x + 4

Solve it,

4x = 3x + 30

x = 30

Input x to each angles,

Angle 2,

4(30) - 26 = 120 - 26 = 94

Angle 3,

3(30) + 4 = 90 + 4 = 94

Hope this helps :)

Let me know if there are any mistakes!!

What is 2+1 -6 +29 x3

Answers

Answer:

84

Step-by-step explanation:

2+1-6+29*3

= 2+1-6+87

= 3-6+87

= -3+87

= 84

Help please! This is due tomorrow!

Answers

6.5 is the answer for that problem

Find the volume of the rectangular prism.

Answers

Would the answer be 250?
volume would be: 281.25 ft.^3

v = lwh

v= 4.5 * 6.25 * 10

v= 281.25

I need to show the work:

Answers

9514 1404 393

Answer:

  19.25 miles

Step-by-step explanation:

Antoine's rate before lunch was ...

  (5.25 mi)/(3 h) = 1.75 mi/h

Then his rate after lunch was ...

  2×(1.75 mi/h) = 3.5 mi/h

The distance he hiked after lunch was ...

  distance = speed × time

  (4 h)×(3.5 mi/h) = 14 mi

The distance Antoine hiked is the total of his before-lunch distance and his after-lunch distance:

  5.25 mi + 14 mi = 19.25 mi

-5r- (6r- 1)
Whats the answer?

Answers

-11r+1 would be ur simplified answer.
Hope this helped

Solve for y





Just ignore this - hhjjjxmznfncnf f cucbc

Answers

Answer:

Step-by-step explanation:

y/7.5=11/10

y=7.5(11)/10

y=8.25mm

Julie and her friends share some orange juice equally. Each person recieves 3/4 cups of juice. Which of the following shows a possible way that the juice was served?

4 cups of juice divided among 3 people
cups of juice divided among 3 people
cups of juice divided among 4 people
3 cups of juice divided among 4 people

Answers

0.25

______________________________________

Answer:

Step-by-step explanation:

3 cups of juice divided among 4 people

Priscilla can make 2 bracelets in 18 minutes. At this rate, how many bracelets can she make in 72 minutes?

Answers

Answer:

8

Step-by-step explanation:

divide 72 by 18 to get 4. multiply 4 by 2 and you get 8. hope this helps

Answer:

make 8 braclets within 72 minutes

Step-by-step explanation:

2 bracelets 4 bracelts 6 bracelets 8 bracelets

18 minutes 36minutes 54minutes 72 minutes

What is the sales tax on a jacket priced at $675 if the sales tax rate is 6%? The sales tax is $​

Answers

Answer:

$ 37.50

Step-by-step explanation:

We can rewrite this problem as: What is 6% of $625?

"Percent" or "%" means "out of 100" or "per 100",

Therefore 6% can be written as 6/100.

When dealing with percents the word "of" means "times" or "to multiply".

Finally, lets call the sales tax we are looking for "t".

Putting this altogether we can write this equation and solve for t while keeping the equation balanced:

t=6100×$625

t=$3750100

t=$37.50

Answer:

40.50

Step-by-step explanation:

Sales price x sales tax rate = sales tax

675 x .06 (6%) = 40.50

PLEASE HELP ITS URGENT I HAVE 3 MINS AND IM FAILING I REALLY NEED A A ASAP PLEASE HELP

Answers

Answer:

Here to save the day Incoming freshman = 0.72 Freshman & on campus = 0.44So 44% or A

Answer:

A) 44%

Step-by-step explanation:

A scientist studied the migration pattern of two types of whales.

Humpback Whales traveled 2,240 miles in 28 days.

Gray Whales traveled 2,368 miles in 32 days.



If the Humpback Whales had traveled at the same rate for 32 days, how many more miles would they have traveled than the Gray Whales?

Answers

Answer:

not sure

Step-by-step explanation:

its wird

2x – 3y =-11
3x +2y =29

Answers

Answer:

(5,7)

did you need and explanation?

U=x(v + w)/k solve for x
Helpppppp

Answers

Answer:

[tex]\displaystyle x = \frac{Uk}{v + w}[/tex]

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right  

Equality Properties

Multiplication Property of Equality Division Property of Equality Addition Property of Equality Subtraction Property of Equality

Step-by-step explanation:

Step 1: Define

[tex]\displaystyle U = \frac{x(v + w)}{k}[/tex]

Step 2: Solve for x

[Multiplication Property of Equality] Multiply k on both sides:                    [tex]\displaystyle Uk = x(v + w)[/tex][Division Property of Equality] Isolate x:                                                       [tex]\displaystyle \frac{Uk}{v + w} = x[/tex]Rewrite:                                                                                                            [tex]\displaystyle x = \frac{Uk}{v + w}[/tex]

solve the system x2-4y+3=0; x-y=0

Answers

Point form: (3,3) (1,1)
Equation form: x= 3, y=3, x=1, y= 1


WILL GIVE BRAINLIEST
3. What is the domain of the relation graphed below?
(3,5)
(-4,1)
(6,0)
(-2,-1)
(0,-5)

Answers

Answer:

the 3rd one

Step-by-step explanation:

Answer:

(6,0) is the right one I think it might not be right but happy to help

Step-by-step explanation:

Is the following shape a right triangle? How do you know?
O A. No, there is no right angle.
O B. Yes, two sides are perpendicular, and the side lengths fit the
Pythagorean theorem.
O C. No, the side lengths do not fit the Pythagorean theorem.
O D. There is not enough information to determine.

Answers

I think the answer is b if I’m not mistake

Yes, two sides are perpendicular, and the side lengths fit the Pythagorean theorem. The correct answer is option B.

What is a right-angled triangle?

A right triangle is a triangle in which one of the angles is at a right angle or two of the sides are perpendicular, or more formally, an orthogonal triangle, formerly known as a rectangle triangle.

In the given figure two sides are perpendicular, and the side lengths fit the Pythagorean theorem. the figure is a right-angled triangle.

To know more about the right-angled triangle follow

https://brainly.com/question/18452950

#SPJ5

4 x 2/4 as a mixed fraction

Answers

4 x 2/4

2/4 can be reduced to 1/2

Now you have 4 x 1/2

Multiply 4 by 1 then divide by 2:

4 x 1 = 4

4/2 = 2

The answer is 2

q÷ 6 = 4 plzzzz helppp I need answerss ASAP

Answers

Answer:

q=24

Step-by-step explanation:

the opposite of division is multiplication so 4x6=24. then you check this by of course imputing your answer into the equation. 24 ÷ 6 =4

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