Four coins are flipped. what is the probability of the coins all landing heads up ?

   1/16

Step-by-step explanation:

The Probability of getting heads  out of the two options (head or tails)

P(h) = 1/2   = heads / total

Each coin flip is an independent event so we can multiply the probabilities

4 heads in a row = P(h)*P(h)*P(h)*P(h)

                                1/2 * 1/2 * 1/2* 1/2

                                 1/16

7 weeks

step-by-step explanation:

convert each fraction to the least common multiple of 20, so 3/4 = 15/20 & 1/10 = 2/20, then divide 15 by 2 and you get a little over 7, so the food will last 7 weeks.

step-by-step explanation: