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Jet001 [13]
3 years ago
7

Help me plz plz plz i will give the brainliest .

Mathematics
1 answer:
Darina [25.2K]3 years ago
5 0

Answer:

-100

Step-by-step explanation:

hope this helps...

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12r − m; r=-2; m=12<br> could you help me with this???
densk [106]

Answer:

-36

Step-by-step explanation:

R=-2

M=12

12(-2)= -24-12=

8 0
3 years ago
Find all solutions to the equation in the interval [0, 2π).<br><br> cos 4x - cos 2x = 0
Andrew [12]
Solve cos(4x)-cos(2x)=0  &forall; 0<=x<=2pi  ..............(0)

Normal solution:
1. use the double angle formula to decompose, and recall cos^2(x)+sin^2(x)=1
cos(4x)=cos^2(2x)-sin^2(2x)=2cos^2(2x)-1    .................(1)
2. substitute (1) in (0)
2cos^2(2x)-1-cos(2x)=0
3. substitute u=cos(2x)
2u^2-u-1=0
4. Solve for x
factor
(u-1)(u+1/2)=0
=> u=1 or u=-1/2
However, since cos(x) is an even function, so solutions to
{cos(2x)=1, cos(-2x)=1, cos(2x)=-1/2 and cos(-2x)}  ...........(2)
are all solutions.
5. The cosine function is symmetrical about pi, therefore
cos(-2x)=cos(2*pi-2x), 
solution (2) above becomes
{cos(2x)=1, cos(2pi-2x)=1, cos(2x)=-1/2, cos(2pi-2x)=-1/2}
6. Solve each case
cos(2x)=1 => x=0
cos(2pi-2x)=1 => cos(2pi-0)=1 => x=pi
cos(2x)=-1/2 => 2x=2pi/3 or 2x=4pi/3 => x=pi/3 or 2pi/3
cos(2pi-2x)=-1/2 => 2pi-2x=2pi/3 or 2pi-2x=4pi/3 => x=2pi/3 or x=4pi/3
Summing up,
x={0,pi/3, 2pi/3, pi, 4pi/3}
3 0
3 years ago
Find the radius of a circle whose circumference is 56.52 cm. Round your answer to the nearest whole number
LekaFEV [45]

Answer:

9 cm

Step-by-step explanation:

hope it helps<3

8 0
3 years ago
(-2,5) (2,0) What is the slope of the line
Crazy boy [7]

Answer:

-5/4

Step-by-step explanation:

formula

y2-y1=x2-x1

0-5 over 2+2=-5/4

3 0
3 years ago
What is the nth term of the sequence -4 -9 -14 -19
vlabodo [156]

Answer:

-44

Step-by-step explanation:

first term is -4, second -9, third -14, fourth -19, etc.

there is constant difference (-5) between each two neighbor terms

you can use calculator by pushing the following buttons: -4-5========

the method is:

1) insert first term (-4)

2) insert a difference (-5)

3) push the "=" button 1 time less than the desired term number

So, if you must find 9th term, you push "=" button 8 times

after pushing buttons -4-5======== you get a result -44 on a calc

6 0
3 years ago
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