Hana buys a new dress for $40. how much does she pay if there is a 7% tax

$42.80
$47.00
$2.80
$37.20

This doesn’t make sense to me it’s supposed to be lcm ( least common multiple )

You have a 32-foot fence around a square garden. there are 4 equal sections. you paint 13 of one section of the fence. what fraction of the fence did you paint? you have a 32-foot fence around a square garden. there are 4 equal sections. you paint 13 of one section of the fence. what fraction of the fence did you paint?

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?