1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Verdich [7]
3 years ago
8

In a box there are 21 identical pieces that have been enumerated using odd numbers from 5 to 45. How many tiles should be drawn

at random to obtain with certainty 3 tiles whose numbering sum exactly 33?
Mathematics
1 answer:
Orlov [11]3 years ago
4 0

These are the only combinations of exactly 3 tiles that add to 33.

5,7,21

5,9,19

5,11,17

5,13,15

7,9,17

7,11,15

9,11,13

All tiles with numbers above 21 do not help you. 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45. There are 12 of them.

Every three-number combination must have one of the numbers 5, 7, or 9, so if the six numbers from 13 to 21 are picked, in addition to the 12 higher numbers mentioned above, you already picked 18 tiles, and you still have no solution. To obtain the solutions 5,7,21; 5,9,19; 7,9,17; he needs two more numbers in addition to the 18 he already has, so he needs 20 tiles in total to be guaranteed three of them add to exactly 33.

Answer: 20 tiles

You might be interested in
A 60 - kilogram person stands on a compression spring . The spring constant is 2500 Newtons per meter .
insens350 [35]
<h2>Answer:0.2352m</h2>

Step-by-step explanation:

Let the mass of the person be m.

Let the spring constant be k.

Let the displacement in spring be x

Let the acceleration due to gravity be g

As it is given that the person just stands,the forces are balanced.

So,mg=kx

Given,

m=60Kg\\k=2500Nm^{-1}\\g=9.8ms^{-2}

60\times 9.8=2500\times x\\x=\frac{588}{2500}=0.2352m

6 0
3 years ago
What is the branch of mathematics developed by isaac newton called today?.
joja [24]

Answer: Calculus.

Step-by-step explanation: He created calculus.

3 0
2 years ago
28. What is the solution to 12-(2x+6) = -4x +10 +2(x-8) *
S_A_V [24]

Answer:

A-no solution

Step-by-step explanation:

There are no values of x that make the equation true.

7 0
3 years ago
Read 2 more answers
A walkway forms one diagonal of a square playground. The walkway is 14 m long. How long is a side of the playground?
Vilka [71]

Answer: The side of the playground is around 10 meters long

Step-by-step explanation:

use the diagonal as the hypotenuse of a right triangle, where the sides of the square form the legs of said triangle.

Usually

a^{2} +b^{2} =c^{2}

since we know a and b are the same length (sides of a square are congruent) we would have

a^{2} +a^{2} =c^{2} \\2a^{2} =c^{2}

We know that c is 14 so

2a^{2} =14^{2} \\2a^{2} =196\\a^{2} =98\\a=\sqrt{98} \\a= 9.999

5 0
2 years ago
Mark uses an app that shows him how many kilometers he has run to prepare for a marathon. The app said he ran 9.654 kilometers.
Viefleur [7K]

Answer:

5.9987174899

Step-by-step explanation:

9.654km / 1.609344

= 5.9987174899mi

4 0
3 years ago
Other questions:
  • Devon is trying to find the unit price on a six pack of drinks on sale for $2.99 his sister says that at that price each drink s
    14·1 answer
  • The symphonic band is having their annual winter performance the equation 2 a + 5s= 41 represents money collected on the first n
    9·1 answer
  • - The wait times for two different rides are
    13·1 answer
  • What is seven less than the product of four and a number in numeric form. PLZZ I will give you 100 points
    13·2 answers
  • Im doing math and i need help in this question
    13·1 answer
  • - To make homemade window cleaner, Shivani combines vinegar and water in the ratio of 1:7 by volume. How
    7·1 answer
  • B) Find the value of 2^-3 x 3^-2
    11·2 answers
  • NO LINKS OR ASSESSMENT!!<br><br>Write a rule to describe each transformation #9 &amp; #11​
    9·2 answers
  • Evaluate : limx→ tan2-sin2x x3
    9·1 answer
  • I need help With my homeworkTITLE: Interpret and write equations From Table
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!