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3 years ago

CAN SOMEONE PLZ HELP! need help with 14 and 15

Mathematics

1 answer:

Vanyuwa [196]3 years ago

3 0

Oh this is super easy okay so the hypothesis is the long size and the Pythagorean theorem is a2+b2=c2

So 7(2) can be a2 ( or b2 it doesn’t matter)

So let’s put this in the equation

7(2)+b2=c2

So c2 is always ALWAYS gone be the hypothesis (long side) so it’s 10(2)

49+b2=100

So since we don’t have a b2 we’re gonna SUBTRACT

100+49= 149

Now take the squareroot

149= 12.206 so this is the answer

Now you do number 15 by yourself and I help you in the comments!!!! :)

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In a certain Algebra 2 class of 30 students, 14 of them play basketball and 10 of them play baseball. There are 14 students who

Veseljchak [2.6K]

Answer:

In a certain Algebra 2 class of 30 students, 22 of them play basketball and 18 of them play baseball. There are 3 students who play neither sport. What is the probability that a student chosen randomly from the class plays both basketball and baseball?

I know how to calculate the probability of students play both basketball and baseball which is 1330 because 22+18+3=43 and 43−30 will give you the number of students plays both sports.

But how would you find the probability using the formula P(A∩B)=P(A)×p(B)?

Thank you for all of the help.

That formula only works if events A (play basketball) and B (play baseball) are independent, but they are not in this case, since out of the 18 players that play baseball, 13 play basketball, and hence P(A|B)=1318<2230=P(A) (in other words: one who plays basketball is less likely to play basketball as well in comparison to someone who does not play baseball, i.e. playing baseball and playing basketball are negatively (or inversely) correlated)

So: the two events are not independent, and so that formula doesn't work.

Fortunately, a formula that does work (always!) is:

P(A∪B)=P(A)+P(B)−P(A∩B)

Hence:

P(A∩B)=P(A)+P(B)−P(A∪B)=2230+1830−2730=1330

7 0

3 years ago

8.) It takes Fred 9 minutes to type and spell check 13 pages of a manuscript. Find how long it takes him to type and spell check

inysia [295]

It will take Fred 42 minutes to type and spell check 60 pages.

Let the first scenario be A.

Let the second scenario be B.
Let the unknown time be X.

Given the following data;

Time taken A = 9 minutes

Number of pages A = 13 pages

Number of pages B = 60 pages

Time taken B = X minutes

To find how long it takes him to type and spell check 60 pages;

We would use direct proportion to express the work described and solve for the unknown variable (time).

$9 \;minutes : 13 \;pages\\\\X \;minutes : 60 \;pages$

Cross-multiplying, we have;

$9$ × $60$ $= 13$ × $X$

$540 = 13X\\\\X = \frac{540}{13}$

X = 41.54 ≈ 42 minutes

Therefore, it will take Fred 42 minutes to type and spell check 60 pages.

Find more information: brainly.com/question/89674

7 0

3 years ago

Can someone help me. please! At the end, it says x less that 1, but greater than 0.

Afina-wow [57]

Then its 0. something. but not a whole number :) hope this helped

7 0

4 years ago

Okay so plz answer this question step by step,, thank you

Vikentia [17]

Given:

Total number of students = 20

The marks of the students are 40, 22, 36, 27, 30, 12, 15, 20, 25, 31, 34, 36, 39, 41, 43, 48, 46, 36, 37 and 40.

To find:

The frequency distribution table with class size 10.

Solution:

We have, the marks of 20 students.

40, 22, 36, 27, 30, 12, 15, 20, 25, 31, 34, 36, 39, 41, 43, 48, 46, 36, 37, 40

Here,

Minimum value = 12

Maximum value = 48

We nee class intervals of size 10. So, the required class intervals are 10-20, 20-30, 30-40, 40-50. In these intervals, lower limit is excluded but the upper limit included.

The required frequency distribution table is

Class intervals Marks Frequency

10-20 12, 15 2

20-30 22, 27, 20, 25 4

30-40 36, 30, 31, 34, 36, 39, 36, 37 8

40-50 40, 41, 43, 48, 46, 40 6

Total 20

Therefore, the frequency distribution table is

Class intervals: 10-20 20-30 30-40 40-50 Total

Frequency : 2 4 8 6 20

8 0

3 years ago

Estoy conduciendo pro la carretera durante un viaje a través del país, avanzas a una velocidad constante de 60 millas por hora ¿

RUDIKE [14]

Answer:

Tu intiendo engles? Me inteindo poquito espanol but me no inteindo mas/

6 0

3 years ago