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1d
answered solve problems using linear systems
2d
comment understanding how multiplying a number by itself and than using the result for division gives you a consistent result
since no paranthesis are used start from left to right, step (1) $1200 / 40 = 30$, step (2) $30 \times 40 = 1200 $
Jun
28
comment Advise me a book please
Higher Algebra by Hall and Knight and Coordinate Geometry by Loney , both available free at www.archive.org, for drawing graphs "Plotting Graphs" by Shilov at www.mirtitles.org
Jun
26
comment find coordinate on line at given distance from given coordinate
$5=\sqrt{(x+2)^2+(y+4)^2}\Rightarrow (x+2)^2+(y+4)^2=25$...(I); slope=$\frac{4+4}{3+2}=\frac{8}{5}$ ; $y=\frac{8}{5}x+c \Rightarrow -4=-(\frac{8}{5})2+c \Rightarrow -4+\frac{16}{5}=-\frac{4}{5}=c$ ; $\therefore y=\frac{8}{5}x-\frac{4}{5}\Rightarrow 5y=8x-4$...(II), solve (I) and (II), you will get two points
Jun
26
reviewed Approve find coordinate on line at given distance from given coordinate
Jun
26
comment Why do we switch the denominator and numerator when we divide fractions?
denominator's denominator is numerator
Jun
23
answered How to get the given equality?
Jun
23
comment what is first negative term of this series given series
I think it will be 6th term, because for the 6th term the coefficient $(n-1)(n-2)(n-3)(n-4)(n-5)$ will be negative as $\frac{13}{3}-5=\frac{13-15}{3}=\frac{-2}{3}$
Jun
21
comment Coordinate Geometry and Trigonometry book recommendation for GRE Math Subject Test
have a look at Coordinate Geometry by Loney and Trigonometry by Loney, both are classics, softcopy free available at archive.org, very cheap hardcopy available in India, both are used by students preparing for IIT entrance, very concise theory and large number of problems with answers.
Jun
19
comment Value of $\frac{1}{\log_aabc}+\frac{1}{\log_babc}+\frac{1}{\log_cabc}$
$y=\frac{\ln a}{\ln abc}+\frac{\ln b}{\ln abc}+\frac{\ln c}{\ln abc}$
Jun
16
accepted Sine of an obtuse angle
Jun
16
comment Sine of an obtuse angle
Oh, I feel you both are right, thanx
Jun
16
comment Sine of an obtuse angle
"sin(180-x)=sin x" is after this topic, so I can not use it
Jun
16
comment Sine of an obtuse angle
my query is how $\sin MOP'=\frac{M'P'}{OP'}$ ?
Jun
16
asked Sine of an obtuse angle
Jun
12
answered Find the value of F $(\frac{1.5}{F})^2 +cos^2 (75)+ (\frac{1.25}{F})^2 = 1$
Jun
10
comment Could someone explain to me why the range of the graph is R\(0,5]
you can answer your own question, it is encouraged, I will upvote it
Jun
10
comment Could someone explain to me why the range of the graph is R\(0,5]
oh yes, you are right, it should be R~(0,10]
Jun
10
comment Could someone explain to me why the range of the graph is R\(0,5]
range is entire vertical line/Y-axis minus points between 0 and 5 such that 0 is included in the range and 5 is not included in the range which the book chose to write as R \ (0,5], generally it is written as R~(0,5]
Jun
9
comment Graph and domain of $\frac{2}{7+\sqrt{x}}$
let $y=\frac{2}{7+\sqrt{x}}$, compare this with $y=\frac{1}{x}$, you must know the shape of $y=1/x$, $\sqrt{x}\geq 0$ so the domain will be positive x axis, the starting point will be when $x=0$ and so $y=2/7$, this will be the max value, after that the graph goes on decreasing