All categories

2 years ago

I need help plzzz i will give brainliest

Mathematics

1 answer:

Mrrafil [7]2 years ago

7 0

Answer:

given below

Step-by-step explanation:

Valid:

n * 5 = 5n .....1st option
n(1+1+1+2) ........4th option
n * 5 = 5n ............5th option
1*n+1*n+1*n+2*n ........sixth option

Invalid:

1(n + 2n) ............3rd option
0*n+0*n+0*n+2*n ...............2nd option

You might be interested in

Mr.Lee wants to survey 20 of the 210 students in seventh grade about the hours they slerp each night. He finds 2 of the 20 stude

allsm [11]

21 students sleep for 9 hours each night

<em><u>Solution:</u></em>

Given that, Mr.Lee wants to survey 20 of the 210 students in seventh grade about the hours they sleep each night

He finds 2 of the 20 students surveyed sleep for 9 hours each night

Therefore, 2 out of 20 students sleep for 9 hours each night

Find out the percentage of 2 out of 20

$\rightarrow \frac{2}{20} \times 100 = 10 \%$

Thus 10 % of 210 students sleep for 9 hours each night

Find out 10 % of 210

$\rightarrow 10\% \text{ of } 210\\\\\rightarrow 10 \% \times 210\\\\\rightarrow \frac{10}{100} \times 210\\\\\rightarrow 21$

Thus 21 students sleep for 9 hours each night

6 0

3 years ago

Quick question what’s 2ab+3b+7b+3a•3a•b+4b-8ab•8ab+5a•5a•b-12ab?

Blababa [14]

Answer:

14b - 10ab + 34a²b - 64a²b²

Step-by-step explanation:

We have to simplify the expression

2ab + 3b + 7b + 3a × 3a × b + 4b - 8ab × 8ab + 5a × 5a × b - 12ab

= 2ab + 3b + 7b + 9a²b + 4b - 64a²b² + 25a²b - 12ab

{Since (3a × 3a × b) = 9a²b, (8ab × 8ab) = 64a²b² and (5a × 5a × b) = 25a²b}

= 2ab + 10b + 9a²b + 4b - 64a²b² + 25a²b - 12ab

= 14b - 10ab + 34a²b - 64a²b² (Answer)

3 0

3 years ago

What value of x makes this proportion true? 36/48 = x/24

ruslelena [56]

Answer:

Step-by-step explanation:

18/24 is a 1/2 reduction from 36/48.

3/4 is simplest form.

8 0

3 years ago

If you could help me from #15 Thanks

KatRina [158]

I am sorry but I can not see this image. Sorry XD

7 0

4 years ago

Use the Law of Cosines to find the side length c. Use the Law of Sines to find angle B of the triangle in the previous problem.

Ray Of Light [21]

Step-by-step explanation:

Let a = 8 and b = 11. Using the law of cosines, we can write

$c^2 = a^2 + b^2 - 2ab\cos{c}$

$\:\:\:\:=(8)^2 + (11)^2 - 2(8)(11)\cos{37} = 44.44$

$c = 6.67$

Now we're going to use the sine to find $\angle{B}:$

$\dfrac{\sin{B}}{b} = \dfrac{\sin{37}}{c}$

$\sin{B} =\left(\dfrac{b}{c}\right)\sin{37} = 0.992$

$B = \sin^{-1}(0.992) = 83.0°$

8 0

3 years ago