A shopkeeper marks the price of an calculator at 25% above cost price. He then allows a discount of 15% of the marked price and he still makes profit Rs.900. Find out the marked price of an calculator .​

There is a line with slope 1/a going through the point (a, a²). find the equation of the line perpendicular to this line at this point. (don’t let this problem intimidate you! solve the problem as you would if i’d given you specific values. just use variables instead.)

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Which rule describes the composition of transformations that maps ajkl to aj"k"l"? ro. 900 o to, -2(x, y) to, -20 ro, 900(x, y) ro, 9000 t-2. o(x,y) t-2, 00 ro, 900(x, y)