Help me with this please! Will mark brainliest!

1)2500

2) 1500

3)2.5%

Step-by-step explanation:

1) the standard formula for interest is i=prt where  i= interest, p= principal and t=time

In the first scenario, everything but the principal is given so lets substitute the info into the equation:

75=p*0.03*1

75= 0.03p

75/0.03=p

2500=p

Same thing for second scenario, just different numbers

120=0.04*2*p

120=0.08p

1500=p

This time everything but the rate is given:

250=10000*1*r

250=10000r

Divide both sides by 10000

0.025=r

2.5%=rate(convert into percentage)

Hope this helps!

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.