With one ! amy can ride her bike 4 miles in 30 minutes. sebastian can ride his bike 3 miles in 24 minutes. at her 24current rate, what is the distance, in miles, amy can ride her bike in 12 minutes? (a) 1.6(b) 2.5(c) 3.0(d) 9.0 sally drives 66 miles in 3 hours and molly drives 72 miles in 4 hours. what is the difference between 23their average speeds, in miles per hour? (a) 4(b) 6(c) 18(d) 22

24. (A) 1.6

23. (A) 4

Amy's distance is proportional to the time spent riding, so in 12/30 of the time (12 minutes out of 30 minutes), she will ride 12/30 of the distance:

... (12/30)·(4 mi) = 48/30 mi = 1.6 mi

Sally's speed is (66 mi)/(3 h) = 22 mi/h. Molly's speed is (72 mi)/(4 h) = 18 mi/h.

The difference between their speeds is (22 -18) mi/h. = 4 mi/h.

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.

answer: your correct answer is b. d.

step-by-step explanation: