You and your friends are planning to join a cycling tour of europe. you want to know how much it will cost you and your friends to get from london to dover and then from dover to calais. each person will need to spend the following: £45 on a train ticket from london to dover. £15 on a ferry ticket from dover to calais. £5 for food during the trip.

What is the value of x when x + 7 = 21?

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

Martha has a deck of cards. she has lost some of the cards, and now the deck only contains nine spades, eleven diamonds, eight clubs, and twelve hearts. martha predicts that whenever she draws a card from the deck without looking, she will draw a club one-fifth of the time. which activity would best allow martha to test her prediction? a. randomly draw a card from the box and see if it is a club. b. randomly draw a card. then, continue to draw another card until all eight clubs are drawn. c. randomly draw and replace a card 120 times. then, observe how close to 30 times a club is drawn. d. randomly draw and replace a card 100 times. then, observe how close to 20 times a club is drawn.