Melody

Guest:

(x-4)(x+4)=

fpogue:

P = -0.01x^2 + 168x - 120000

nicol:

whats 6x-7=x=3 please simplify

GeometryKid:

On the calculater for this website how do you use the sin-1( , cos-1( , and tan-1(? I have try but when I go into 2nd there is no button for it.Can some one help me?

Guest:

Sam traveled 3/4 of a journey by bus. He jogged 1/2 of the remaining distance and walked the rest of the way. If he walked 800 feet, what was the total distance he traveled?

I got 6,400 ft. Is this correct?

Guest:

Here's the math problem:
A bus driver filled up 7/8 of her fuel tank for a trip. She used 6/7 of the fuel by the end of the trip. The capacity of her tank is 70 gallons. How much fuel did she use for the trip? Express your answer as a decimal.

Don't use algebra, I haven't learned it.

Rom:

You need to show that T and U have the same y coordinate.

T has y coordinate apq
U has y coordinate -apr

but if you look at the coordinates of P and Q and note that PQ is perpendicular to the axis of the parabola then it should be clear that q = -r

so both T and U have y coordinates apq and thus TU is horizontal and thus perpendicular to the vertical parabola axis.