Mary purchased a prepaid phone card for $15 . long distance calls cost 6 cents a minute using this card. mary used her card only once to make a long distance call. if the remaining credit on her card is $13.38 , how many minutes did her call last?

could you explain how you got this. (i am really hopeless at

Out of $20$ creepy-crawly creatures in a room, $80\%$ are flies and $20\%$ are spiders. if $s\%$ of the total legs belong to spiders, what is $s$?

The longer leg of a 30-60-90 trangle is 18

Solve these problems: 1.what is the perimeter of an equilateral triangle with sides measuring 6cm? 2. a regular pentagon has sides measuring 3.2 cm. what is its perimeter? 3. a regular decagon has sides of 3.5mm . what is it’s perimeter? 4. a regular octagon has a perimeter of 64cm. what is the length of one of the sides? 5. a regular hexagon has a perimeter of 72mm . what is the length of one of the sides? 6. what is the perimeter of a rhombus with sides measuring 11m?