Math help please , i haven't done math in years

Name the quadrant in which the following points lie.
a.( 4, 5 )
b.(-3, -7)
c.( 4, 0 )
d.( 5, -2)

Find the slope of the line that contains the points (-4, 8) and (-2, -5)

Find the slope of the line 3x - 5y = 15. What is the y-intercept?

Use the Pythagorean Theorem to find the missing side of the right triangle.
http://img155.imageshack.us/i/mag03ls20p401.gif/

Find the distance between the points (3, -5) and (-4, -6).

Find the area of a circle with diameter equal to 14 in.

Find the volume of a cone with a height equal to 11 cm. and a base with radius equal to 3 cm.

a=first quadrant. two positive ordinates.
b=third quadrant. two negative ordinates.
c=on x-axis, so it is in the intersection of both the first and fourth quadrants.
d=fourth quadrant= positive x-ordinate, and negative y-ordiante.

Slope of first line is: (rise/run)=(8-(-5))/((-4)-(-2))=(13/(-2)… -6.5

second line's slope=(3/5), 5y=3x-15: y=(1/5)(3x-15) .'. slope =3/5. the y-intercept=3.

9^2=4^2+x^2: 81-16=x^2=65. therefore, the length of the last side is x=(65)^(1/2)

distance between points= ((3+4)^2+(-5+6)^2)^(1/2)=(50)^(1/2)

pi*(14/2)^2=area.

volume of cone=base area* height= 11*(pi*3^2)=99pi