Frank can make 3 bird houses in 12 days. How many days will it take him to make 21 bird houses?

5.25

Step-by-step explanation:

3 divided by 12 = 0.25 (this how many he can make per day)

Now that we have how many bird houses per day (0.25), we can multiply that for the amount it takes. (21 bird houses) to get 5.25

u rich

step-by-step explanation:

0.16 or 16%

step-by-step explanation:

lets take a coin for example.

if you toss it twice, it has a 1/4 chance of landing on heads both times because 1/2 * 1/2 is 1/4.

with the cards, the chance of picking dog is 0.4. having two people pick one is like picking a card twice in a row. so 0.4 * 0.4 is 0.16, or 16%