# Math Help - solving equations

1. ## solving equations

cant get my head round equations

eg 8-4(x-1)=2+3x

how do I go about it
how to find radius of base of cone 250cm3, ht 20cm.cant get brain in gear

2. Originally Posted by bobbie bruce
cant get my head round equations

eg 8-4(x-1)=2+3x
do you know how to expand brackets? expand - 4(x - 1) then try to get the x on one side of the equation

how to find radius of base of cone 250cm3, ht 20cm.cant get brain in gear
recall that:

$V = \frac {1}{3} \pi r^2 h$

you are given $V = 250$, $h = 20$ so just plug those in and solve for $r$

try them. if you have problems, say so