cosinusix
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Answered a Question in Math
Look at the family of parabolae y=ax^2 where a is the parameter. Their graphs are nested into each other. All of them passes through the point (0,0). The smaller a is, the flatter the curve is. ... 
Answered a Question in Math
1. sides:x=0 x=8 y=0, y=6 Diagonal AC :`y=6/8 x=3/4x` Diagonal BD: slope`=(60)/(0(8))=6/8=3/4` Slope point equation `y0=(3/4)(x(8))` Equation of BD: `y=(3/4) x+8` 
Answered a Question in Math
expenses: `60*100=6000` Let n be the number of rented apartments `n100=(r800)/(15)` `n=r/(15)+(2300)/(15)` Income `= n*r=r^2/(15)+(2300r)/(15)` Profit=income  expenses=... 
Answered a Question in Math
Th equation is equivalent to `a^2+ba+(cx^2)=0` Use the quadratic formula, Solutions : `a=(b+sqrt(b^24(cx^2)))/2` if `b^24c+4x^2gt=0` . and no solution if `b^24c+4x^2lt0` 
Answered a Question in Math
Let I be `I=int(7x^2 sin (pi x) dx` Integrate it by part `u(x)=7x^2 u'(x)=14x` `v'(x)=sin pi x v(x)=1/(pi)cos pi x` `I=7/pi x^2cos (pi x) int 14x*(1/(pi)cos pi x) dx` `I=7/pi x^2cos (pi x)...
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