Which expression represents the amount of interest earned on d dollars at an interest rate of 2%? 0.2d dollars      200d dollars      2d dollars      0.02d dollars

It is given to us that the interest rate is 2%.

We know that 2% can be rewritten as . Now, we also know that in decimal form, .

Therefore, the interest earned on d dollars at an interest rate of 2% will be "2% of d" which can be rewritten as. This is because  in math, "of" means the same as multiplication.

Thus, out of the given options, the last option is the correct option.

solution:

the given function is ,

      =

the three roots of this quadratic function is , 0 ,8 and 10.all the roots are real and rational.

if a quadratic equation is of the form ,

sum of the roots = a + b +c= 0+8+10=18=  

product of roots taken two at a time = a b + b c+ c a = 0+80+0=80 =  

product of roots = a b c = 0=  

there are 11 doors in a hall starting from 0 to 11.the entry in the hall is permitted through gate number 0 and exit is allowed through only gate number 8 and 10.so, three roots(0,8,10) of quadratic function is given by entry and exit route of this hall.

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step-by-step explanation: