Please help Im doing a homework and i cant figure it out

Someone answer asap for ! the following statements are true about the coins calvin and sasha have collected. * calvin and sasha has the same amount of money. * calvin has only quarters. * sasha has dimes, nickels, and pennies * calvin has the same number of quarters as sasha has dimes. * sasha has $1.95 in coins that are not dimes. exactly how many quarters does calvin have?

David leaves his house to go to school. he walks 200 meters west and 300 meters north. how far is david from his original starting point?

Find the value of x. also give me an explanation so i can complete it to other questions as well, : )