All Answers 358099 Answers

TWO variables (x and y) needs TWO equations for a discreet answer......you CAN graph it.....it is the equation of a line with slope of '1' and a y-axis intercept of -6      The calculator can graph it for you....

We can see very quickly that this has no solution.......it's impossible to perform the same subtraction twice and arrive at two different results [ provided that we subtract correctly....!!!  ]

20+7= 27

57,800,000,000

csc (3pi/ 14)  = 1.603875471608991

I'd like to look at this one in some detail.......I wouldn't have known how to approach it without "guest's" suggestion......so.....I have to give him/her the lion's share of credit.....!!!!

3f(x) + 5f(-x) =x^2 + 7  find f(x)

Let f(x)   be of the form ax^2 + bx + c

So

3f(x)  = 3ax^2 + 3bx + 3c    and let  5f(-x)  = 5ax^2 - 5bx + 5c

And

[3ax^2 + 3bx + 3c ]  +   [5ax^2 - 5bx + 5c] =  x^2 + 7

So, equating coefficients.....we have

[5a + 3a]  = 1  →  8a  = 1  →   a  = (1/8)  and

[3b - 5b] = 0      →  b = 0

[3c + 5c  ]  = 7   →  8c  = 7  →   c = 7/8

So.......

f(x)  = (1/8)x^2  + 7/8

Proof:

3f(x)  = (3/8)x^2 + 21/8       and     5f(-x)  = (5/8)x^2 + 35/8

And adding these, we have........ x^2 + 56/8   =   x^2 + 7

I liked this one........thanks, guest......!!!

I leran something new on here almost every day !!!! 

That finger is very weird

OK, Solveit........"guest" actually arrived at the correct answer, first.....I just kinda' confirmed it....!!!

that finger of yours is so weird

Sorry, folks.......the answer to this question is shown by the graph below :

The solutions occur at 30, 90 and 150  degrees......

See my "workings" here : http://web2.0calc.com/questions/unanswered-question-x-being-an-angle-solve

Thanks Guest and CPhill !

You need another equation to solve this 

ax +by + c = 0   subtract   ax, c from both sides

by  = -ax - c       divide both sides by b

y  = (-a/b) x - (c/b)     or, in another form

y =  -[a/b]x +  (-[c/b] )

Note,  the line has a negative slope.....so   -[a/b] < 0   implies  that a/b itself must be positive

Also, the y intercept, (-[c/b] ),  is positive........thus, -[c/b]  > 0     which implies that c/b < 0

So.....as guest has said, I and III are correct  and (E) is the answer.....

Solve for a:
a-6 = -1-a

Add a+6 to both sides:
2 a = 5

Divide both sides by 2:
Answer: | a = 5/2

a-6=8-9-a

move "a"  to the left side with opposite sign and  6 to the right side with opposite sign 

a+a=8-9+6

2a=5

a=5/2

a=2.5

Will make it a little easier. This is actually how our teacher gave it to us:             1, 4, 9, 16, 25, 36, 49, 64, 81, 10, 22............?

There is no solution. 

your equation is wrong may be you forget smth

well since both "y"s and "x"s cancel each other out, your left with ...

    -21 

-    -9

----------

30

Note......if we set the "y's" equal, then we have

4x - 2   = 5

Then.......the resulting x value for the solution of this equation is the x coordinate for the intersection point.......so.........add 2 to each side

4x  = 7     divide both sides by 4

x = 7/4      so........ (3, 6)  cannot possibly be the intersection point

And as  xvxvxv pointed out,  the intersection point is actually (7/4, 5)  or ( 1.75, 5)

Here's the graph of the intersection point to confirm this:   https://www.desmos.com/calculator/sl2lhr8m1w

OK Solveit..... put it into standard   y = mx + b form

y = -a/b x - c/b        From this you can see the slope (and by looking at the graph) is NEGATIVE   so  m = -a/b is negative which means a/b is POSITIVE     so I is an answer

b is the y intercept of the line    or  -c/b  from the graph we can see that -c/b is POSITIVE or > 0 so c/b must be NEGATIVE which means III is true also

So I would say answer   'E'          if I did this all right!

1.7...........

1.7.....

it is obviously ab i am an expert in maths basically i am a teacher in a university!

multiplying the angle ( in radian ) by the radius 

for example, the circumference of the circle = 2*pi*r 

where (2*pi) is the angle and ( r ) is the radius.