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Sidana [21]
3 years ago
5

Pls helppp me this is very very urgent

Mathematics
1 answer:
Nat2105 [25]3 years ago
4 0

Answer:

1. 5040

2. 20

Step-by-step explanation:

1. using the formula for permutation

nPr=n!/(n-r)!

10P4 = 10!/(10-4)!

=10*9*8*7*6!/6!

then we are left with

=10*9*8*7

=5040

2.using the formula for combination

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

6C3=6!/(6-3)!3!

=6*5*4*3!/3!3!

=6*5*4/3*2*1

=20

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(7i)(-4i)<br><br> a. -28i<br> b. 28<br> c. -28<br> d. -32i
levacccp [35]

Hey!

Explanation:

↓↓↓↓↓↓↓↓↓↓

First, remove parenthesis.

7i4i

Secondly, multiple by the numbers.

7*4=28

-28ii

Third, apply exponents rule.

-28i^2

i^2=-1

-28(-1)

Finally, refine.

=28\\

<u><em>Answer⇒⇒⇒⇒28</em></u>

Hope this helps!

Thank you for posting your question at here on Brainly.

Have a great day!

-Charlie

6 0
3 years ago
How to solve -x^2-2x=5?
anastassius [24]
-x^2 - 2x - 5=0
-(x^2 + 2x + 1) -4=0
(x +1)^2= -4
=> Impossible. There is no x
6 0
3 years ago
Rob is saving to buy a new MP3 player. For every $16 he earns babysitting, he saves $7. On Saturday, Rob earned $48 babysitting.
mart [117]
He saved 7(3), which is equal to 21 dollars saved. Hope it helps!
5 0
3 years ago
I need help with this math problem please
Yanka [14]

Answer:

x=12

Step-by-step explanation:

90 = x + 42 + 3x

48 = x + 3x

48 = 4x

12 = x

7 0
3 years ago
Read 2 more answers
An angle measure of 82 degrees is equivalent to ____ radians. Round your answer to the nearest hundredth when necessary.
tester [92]
2pi radians=360 degrees
rato and proprtion
xrad/(2pi)=ydeg/360
xrad/2pi=82/360
times both sides by 2pi
xrad=164pi/360
xrad=41pi/90
aprox pi=3.141592
xrad=1.431
round
xrad=1.43 radians


1.43 radians=82 degrees
5 0
3 years ago
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