David biked 15 9/10 miles on saturday and 6 7/10 miles on sunday. how much farther did david bike on saturday then on sunday? show all of your work.

Can someone check my answer? you : )

Astandard deck of cards contains 52 cards. one card is selected from the deck. (a) compute the probability of randomly selecting a diamond or heart. (type an integer or a decimal rounded to three decimal places as needed.) (b) compute the probability of randomly selecting a diamond or heart or club. (type an integer or a decimal rounded to three decimal places as needed.) (c) compute the probability of randomly selecting queen or club. (type an integer or a decimal rounded to three decimal places as needed.)

Ratio of circumference to diameter example plz i need to now what it looks like.