Question

http://prntscr.com/73woee

Answer 1

@SinginDaCalc2Blues

Answer 2

@dan815

Answer 3

Let's start by forming algebraic equations.
So let the income of R to S be 5x and 7x.
Let expenditure of R to S be 3x and 5x.

Note here that expenditure means SPENDING.
They've told us that both R and S saved 80 each.
Therefore, if we subtract their monthly spending from their monthly income we will get 80.
SO for R...
5x (total monthly pocket money) - 3x (monthly amount spent ) = 2x (monthly amount saved)

We know that R saved 80 right?
Therefore 2x = 80
Solve for x

Answer 4

40?

Answer 5

yep :)
So we know x = 40.
Now at the beginning we said
Ravi = 5x and Sanjeev = 7x.

Plug "x = 40" into both of the equations above to solve for each person's monthly pocket money :)

Answer 6

We know x= 40 so then,
Ravi = 5x
Ravi = 5*40 = 200

Sanjeev = 7x
Sanjeev = 7* 40 = 280

So you're correct :)! Good job!

Answer 7

Can you help me in trigonometry also?
And thanks :)

Answer 8

i can try xD No prrobleem

Answer 9

Alright xD
http://prntscr.com/73wsk7

Answer 10

hmm.. thinking

Answer 11

Do we convert cot54 to tan36?

Answer 12

cot = 1/tan

Answer 13

I know that
@dan815

Answer 14

Start by using the trig rule:
cos ( 90 - theta) = sin theta.

So let's change
cos 64 to get something in terms of sin :)
(so what does 90 - 64 = ? , 90 - 64 = 26)

Therefore ,
cos (90 - theta) = sin theta

cos 64 can be written as:
cos ( 90 - 26 ) = sin 26

Now we know
cos^2 (26) + sin 26 cos 64 + tan 36 / cot54
= cos ^2 (26) + sin^2 ( 26 ) + tan36 /cot54

Now, use the trig identity:
cos^2 x + sin^2 x = 1


Therefore,
cos^2 (26) + sin 26 cos 64 + tan 36/ cot 54
= cos ^2 (26) + sin^2 ( 26 ) + tan36 / cot54
= 1 + tan 36 /cot54


Now , focus on the
"tan36 / cot 54 part"

Note:
tan ( 90 - theta) = cot theta.
Therefore
cot theta = tan ( 90 - theta)
in our case, theta = 54
cot 54 = tan ( 90 - 54)
cot 54 = tan 36

SO noooooow,
cos^2 (26) + sin 26 cos 64 + tan 36/ cot 54
= cos ^2 (26) + sin^2 ( 26 ) + tan36 / cot54
= 1 + tan 36 /cot54
= 1 + tan 36 / tan36
= 1 + 1
= 2

Answer 15

THANKS!!!!!!!

Answer 16

gimme M

Answer 17

for overseeing this operation

Answer 18

LOL please take the time to read it and solve it for yourself ^_^
To recap.
Use the following rules and identities: