Lucas and his sister luisa are saving to buy a birthday present for their mother. the present costs $95. lucas earns $16 per week running errands for neighbors and spends $7 of it. luisa earns $24 per week babysitting and spends $12 of it. which expression can be used to find how many weeks it will take to save for the present? a 95 ÷ [(16 + 7) − (24 − 12)] b 95 ÷ [(16 + 7) − (24 + 12)] c 95 ÷ [(16 − 7) + (24 − 12)] d 95 ÷ [(16 − 7) + (24 + 12)]

Arestaurant offers a $12 dinner special that has 5 choices for an appetizer, 12 choices for an entrée, and 4 choices for a dessert. how many different meals are available when you select an appetizer, an entrée, and a dessert? a meal can be chosen in nothing ways. (type a whole number.)

In a test for esp (extrasensory perception), a subject is told that cards only the experimenter can see contain either a star, a circle, a wave, or a square. as the experimenter looks at each of 20 cards in turn, the subject names the shape on the card. a subject who is just guessing has probability 0.25 of guessing correctly on each card. a. the count of correct guesses in 20 cards has a binomial distribution. what are n and p? b. what is the mean number of correct guesses in 20 cards for subjects who are just guessing? c. what is the probability of exactly 5 correct guesses in 20 cards if a subject is just guessing?

What else equals 42 and 30 for multiply