Melody

FV=12000*(1+0.064)^2.5

Let B be the distance ridden and let W be the distance walked.

$$B+W=186 \quad(1)$$  

now   speed=distance/time

so      time = distance/speed

Time for the bike ride = B/40

Time for walking = W/4

$$\frac{B}{40}+\frac{W}{4}=6$$

multiply both sides by 40 and we have

$$B+10W=240\quad (2)$$

solve equations 1 and 2 simultaneously to get your answers.   

A hectare that was square in shape would have side lengths of 100m

so 100*100=10 000

1 hectare = 10,000 square metres

Well they must  have eaten 3 apples that belonged to someone else. They will have tp pay those back.  That is why

5-8=-3

I am not sure what you mean but the zeros or the roots are the x intercepts which is where y=0

No y will equal zero if any one of those factors =0

ie

x=0       or      x+2=0    or      x+3=0

(9.9 x 10^8) + (5.5 x 10^6)

=(990 x 10^6) + (5.5 x 10^6)

=995.5 x 10^6

=9.955 x 10^8

$$\\(3+\sqrt7)^2 \\\\
=3^2\;+\;2*3*\sqrt7\;+\;(\sqrt7)^2\\\\
=9+6\sqrt7+7\\\\
=16+6\sqrt7$$

No real number squared = a negative number

The answer to your question is an imaginary number

$$\\x^2=-169\\
x=\sqrt{-169}\\
x=\sqrt{-1*169}\\
x=\sqrt{169}\sqrt{-1}\\
x=13i\\$$

What is the stroke in front of the 7 for?

What answer ?