Question 780643
1)
{{{ V = pi*r^2 *h }}}
You want to get {{{ h }}} alone on one side
Divide both sides by {{{ pi*r^2 }}}
{{{ V / ( pi*r^2 ) = h }}}
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2)
{{{ A = (1/2)*h*( b[1] + b[2] ) }}}
{{{ A = (1/2)*h*b[1] + (1/2)*h*b[2] }}}
Try to get {{{ b[1] }}} alone on one side
Subtract {{{ (1/2)*h*b[2] }}} from both sides
{{{ A - (1/2)*h*b[2] = (1/2)*h*b[1] }}}
Multiply both sides by {{{ 2/h }}}
{{{ (2/h)*( A - (1/2)*h*b[2] ) = b[1] }}}
{{{ (2A)/h - b[2] = b[1] }}}
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Hope this helps