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2 years ago

8

On a test Matilda answer 12 are the first 15 problems correctly at this rate continues how many of the next 25 problems while sh

e answered correctly?

1 answer:

Feliz [49]2 years ago

6 0

12/15=x/25
15x=300 so x=20

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One letter was selected at random from the words San Antonio. What is the probability that the selected letter was either an a o

notka56 [123]

Answer:

1:2

Step-by-step explanation:

There are 5 Ns and As in San Antonio. There are 10 total letters. So it is 5:10 which reduces to 1:2

5 0

3 years ago

DJ Davon is making a playlist for work; he is trying to decide what 12 songs to play and in what order they should be played. If

Marta_Voda [28]

Answer:

3.63 * 10^19

Step-by-step explanation:

Given that :

Number of choices to select = 12

Category available :

Blues - 14

Country - 25

Disco - 21

To select an equal number of song for each category ; then 4 songs will be selected from each :

Using combination :

(14C4 * 25C4 * 21C4)

Since the order matters for the 12 selected songs ; it thus requires 12 permutation

Thus ;

(14C4 * 25C4 * 21C4) * 12!

nCr = n! / (n-r)!r!

Using calculator;

14C4 = 1001 ;

25C4 = 12650

21C4 = 5985

12! = 479001600

Hence,

(1001 * 12650 * 5985) * 479001600

= 36301596217286400000

=3.63 * 10^19

5 0

2 years ago

Prove these identities <br>(i) secx cosecx - cotx = tanx<br>

brilliants [131]

Answer:

$(A)\frac 1 {cosx} \frac 1 {sin x} - \frac {cosx} {sin x} = \frac {sin x} {cosx} \\\\(B)\frac{1-cos^2 x }{cos x sin x} = \frac {sin x} {cosx} \\\\(C) \frac{(sin^2x + cos^2x)-cos^2 x }{cos x sin x} = \frac {sin x} {cosx} \\\\(D) \frac{sin^2x }{cos x sin x} = \frac {sin x} {cosx}\\\\(E)\frac {sin x}{cos x} = \frac {sin x}{cos x}$

In step A, you replace all trigonometric functions with their definitions in terms of sine and cosine.

In step B, you add the two together as you add fractions.

In step C, you replace 1 with the sum of the squares of sine and cosine.
In step D, you add the cosine terms together so they disappear.

In step E, finally, you divide numerator and denominator by $sin x$ .

3 0

2 years ago

I need help is it A B C or D

kkurt [141]

Anwer is B...... . ........

7 0

2 years ago

I need some help with this<br><br>

dalvyx [7]

$\pink{\underline{{\boxed{\bf{QUESTION: }}}}}$

-6(x+4) = _____

$\pink{\underline{{\boxed{\bf{OPTIONS:}}}}}$

6x - 4❌
-6x + 4❌
-6x - 24✔️
6x + 24❌

$\pink{\underline{{\boxed{\bf{ ANSWER: }}}}}$

-6(x+4) = <u>-6x - 24</u>

<h3>Hope It's helped! :)</h3>

4 0

2 years ago