Posted by **Krystal** on Monday, September 2, 2013 at 6:10pm.

A woodland jumping mouse hops along a parabolic path given by y=-0.2x^2+1.3x where x is the mouse's horizontal position (in feet) and y is the corresponding height (in feet). Can the mouse jump over a fence 3 feet high? Explain.

I know that x is 3.25 and the mouse's horizontal position in feet and I know that y is 2.1 (2.1125) and the corresponding height in feet. I don't understand how to tell if the mouse can jump over a fence that is three feet high. Could someone please explain this to me?

- Algebra 2 -
**bobpursley**, Monday, September 2, 2013 at 6:17pm
lets look at the graph.

You can plot the graph on your calculator, and see the max height of the mouse. If it is over 3, it can.

with calculus

finding the max

dy/dx=0=-.4x+1.3

x=1.3/.4=3.25

ymax=-.2(3.25^2)+1.3(3.25)=2.11 The mouse will smash into the fence.

- Algebra 2 -
**Krystal**, Monday, September 2, 2013 at 6:21pm
What does the horizontal position mean?

- Algebra 2 -
**bobpursley**, Monday, September 2, 2013 at 6:27pm
Trains travel horizonally, rockets start off mostly vertical (up)

Horizonal means no elevation change.

- Algebra 2 -
**Krystal**, Monday, September 2, 2013 at 6:30pm
So that's how far it has to jump and y is how high it can jump from that point to the fence?

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