(2 1/4)-0.8÷(-0.5)x(-1/4)

D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

0.5/x-0.8 = 0.7/x // - 0.7/x

0.5/x-(0.7/x)-0.8 = 0

0.5/x-0.7*x^-1-0.8 = 0

-0.2*x^-1 = 0.8 // : -0.2

x^-1 = -4

-1 < 0

1/(x^1) = -4 // * x^1

1 = -4*x^1 // : -4

-1/4 = x^1

x = -1/4

x = -1/4

10.416 meters per second

step-by-step explanation:

distance=1 00 meters

time= 9.6 seconds in decimal form or 9 3/5 as a mixed number

average speed= 100/9.6

=10.416 meters per second or 10 52/125 as a mixed number.